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Removed from App Store 8 Jul 2021
Submitted v1.2 to the Apple App Store on 29 Mar 2019. Accepted on 30 Mar 2019.
Changes include:

Updated for iOS 12 and iPhones XR, XS, XS Max.
Added privacy policy link
Content corrections
Localization for Arizona, California and US Federal removed

Submitted v1.0.1 to the Apple App Store on 20 Sep 2016.
Changes include:

Updated for iOS 10 and Swift 3
Added DEA Number check page
Corrected some content

Submitted v1.0 to the Apple App Store on 13 Sep 2016. Accepted on 15 Sep 2016.
Localized for Arizona, California, Colorado and US Federal as default.

Practice prescription reading. Look for bad dose, drug, dates etc. Some prescriptions are correct. Other will have the incorrect dose, past expiry dates or other errors.

Content and suggestions from David Thompson, Connie Valdez and Gina Moore. Thank you.

Valid DEA Numbers

This section is my interpretation of available references. Any and all corrections, suggestions, or advice is welcome. David Bourne.

Determination of valid DEA numbers is described in Pharmacy Law - Examination and Board Review by William J Feinberg (ISBN-13: 978-0071747516), pharmacy-tech-test.com and on Wikipedia. DEA's Pharmacist's Manual.

My best effort - so far

A valid DEA number (for physicians) includes two letters and seven numbers. The first letter designates the registrant category. For physicians this may be 'A' (issued before October 1, 1985), 'B' or 'F'. Other (mid-level practitioners) may have the letter 'M'.

The second letter is meant to represent the first letter of the physicians last name but with a change of last name a previous initial may be valid. Thus, there appears to be no particular check for this second letter other than prior knowledge of a practitioners DEA number.

The remaining seven digits, numbers, consist of six random digits (0-9) and a checksum digit. This checksum digit is calculated as left digit of the sum of the first, third and fifth digits plus twice the sum of the second, fourth and sixth digit. For example:
For the DEA number AB123456x the checksum is calculated from (1 + 3 + 5) + 2 x (2 + 4 + 6) = 33 so the checksum x = 3 for this number to be valid.

The Current Data Set
Dr Name	Dr Address	Pt Name	Expired	Pt Address	Drug Name	Number
	Sig	Refills	Generic	DEA	Signature	ClassUS
Michael Edwards, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Androderm 4 mg patch	30
	Apply 1 patch to back every 24 hours for hypogonadism	Refill 3 times	Yes x No _	AE6259318	Edwards
Michael Edwards, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Androderm 4 mg patch	30
	Apply 1 patch to back every 24 hours Needs indication	Refill 3 times	Yes x No _	AE6259318	Edwards
Michael Edwards, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Androderm 4 mg patch	30
	Apply 1 patch to back every 24 hours Needs indication	Refill 14 times Invalid number of refills	Yes x No _	AE6259318	Edwards
Michael Edwards, MD	Missing Doctors Address	Bill Jones		200 Main St, Aurora CO 80045	Androderm patch Missing Strength	30
	Apply 1 patch to back every 24 hours for hypogonadism	Refill 3 times	Yes x No _	AE6259318	Edwards
Michael Edwards, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Androderm 4 mg patch	30
	Apply 1 patch to back every 24 hours for hypogonadism	Refill 14 times Invalid number of refills	Yes x No _	AE6259318	Edwards
Michael Edwards, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Androderm patch Missing Strength	30
	Apply 1 patch to back every 24 hours for hypogonadism	Refill 3 times	Yes x No _	AE6259318	Edwards
John M Brown, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Lipitor 20 mg	Tab No 30
	1 daily	Refill 11 times	Yes x No _	AB1523679	Missing Doctor signature
John M Brown, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Lipitor 20 mg	Tab No 30
	1 daily	Refill 11 times	Yes x No _	AB1523679	John M Brown
John M Brown, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Lipitor 20 mg	Tab No 30
	1 daily	Refill 11 times	Yes x No _	AB1523679	John M Brown
John M Brown, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Lipitor 20 mg	Tab No 30
	1 daily	Refill 11 times	Yes x No _	AB1523679	Missing Doctor signature
John M Brown, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Lipitor 20 mg	Tab No 30
	1 daily	prn refills	Yes x No _	AB1523679	John M Brown
John M Brown, MD		Bill Jones			Lipitor 20 mg	Tab No 30
	1 daily	Refill 11 times	Yes x No _		John M Brown
Kenneth G McDonald, MD	100 Main St, Aurora, CO 80045	Tom Jones		300 Main St, Aurora CO 80045	Percocet 5/325	Tab No 40
	i q 6 hours prn pain	No Refills	Yes x No _	AM7231436	Kenneth G McDonald	II
Kenneth G McDonald, MD	100 Main St, Aurora, CO 80045	Tom Jones		300 Main St, Aurora CO 80045	Percocet 5/325	Tab No 40
	i q 6 hours prn pain	1 Refill Schedule 2 - No Refills	Yes x No _	AM7231436	Kenneth G McDonald	II
Kenneth G McDonald, MD	100 Main St, Aurora, CO 80045	Tom Jones		300 Main St, Aurora CO 80045	Percocet 5/325	Tab No 2̶0̶ 40 Red Flag: Quantity should not be changed on C2's
	i q 6 hours prn pain	No Refills	Yes x No _	AM7231434 Wrong DEA Number AM7231436	Kenneth G McDonald	II
Kenneth G McDonald, MD	100 Main St, Aurora, CO 80045	Tom Jones		300 Main St, Aurora CO 80045	Percocet 5/325	Tab No 40
	i q 6 hours prn pain	No Refills	Yes x No _	AM7231436	Missing Doctor signature	II
Kenneth G McDonald, MD	100 Main St, Aurora, CO 80045	Tom Jones		300 Main St, Aurora CO 80045	Percocet 5/325	Tab No 40
	i q 6 hours prn pain	No Refills	Yes x No _	No DEA	Kenneth G McDonald	II
Kenneth G McDonald, MD	100 Main St, Aurora, CO 80045	Tom Jones		300 Main St, Aurora CO 80045	Percocet 5/325	Tab No 40
	i q 6 hours prn pain	1 Refill Schedule 2 - No Refills	Yes x No _	No DEA	Kenneth G McDonald	II
Kenneth G McDonald, MD	Missing Doctors Address	Tom Jones		Missing Patients Address	Percocet 5/325	Tab No 400 Invalid Quantity (Max 90 days supply)
	i q 6 hours prn pain	No Refills	Yes x No _	No DEA	Kenneth G McDonald	II
Kenneth G McDonald, MD	100 Main St, Aurora, CO 80045	Tom Jones		Missing Patients Address	Percocet 5/325	Tab No 400 Invalid Quantity (Max 90 days supply)
	i q 6 hours prn pain	No Refills	Yes x No _	No DEA	Kenneth G McDonald	II
Dr Name	Dr Address	Pt Name	Expired	Pt Address	Drug Name	Number
	Sig	Refills	Generic	DEA	Signature	ClassUS
Kenneth G McDonald, MD	Missing Doctors Address	Tom Jones		200 Main St, Aurora CO 80045	Percocet 5/325	Tab No 400 Invalid Quantity (Max 90 days supply)
	i q 6 hours prn pain	No Refills	Yes x No _	No DEA	Kenneth G McDonald	II
Glenda A Green, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Suboxone	Tab No 30
	i tid	Refill 6 times	Yes x No _	AG2576835 Incorrect Number	Glenda A Green	III
Glenda A Green, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Suboxone	Tab No 30
	1 daily	Refill 6 times	Yes x No _	AG2576835 Incorrect Number	Glenda A Green	III
Glenda A Green, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Suboxone	Invalid Quantity
	1 daily	Refill 6 times	Yes x No _	AG2576835 Incorrect Number	Invalid Doctor Signature	III
Glenda A Green, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Suboxone	Tab No 30
	i tid	Refill 3 times	Yes x No _	XG2576835	Glenda A Green	III
Glenda A Green, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Suboxone	Tab No 30
	1 daily	Refill 6 times	Yes x No _	XJ2576835	Bill Jones Invalid Doctor Signature	III
Glenda A Green, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Suboxone SL	No 30
	1 daily	Refill 6 times	Yes x No _	XJ2576835	Bill Jones Invalid Doctor Signature	III
William M Smith, MD	100 Main St, Aurora, CO 80045	Tom Jones		300 Main St, Aurora CO 80045	Tramadol 50 mg	Tab No 30
	i TID prn pain	Refill 5 times	Yes _ No x	FS3728916	William Smith	IV
William M Smith, MD	100 Main St, Aurora, CO 80045	Tom Jones		300 Main St, Aurora CO 80045	Tramadol 50 mg	Tab No 30
	i TID prn pain	Refill 6 times 5 refills in 6 months	Yes _ No x	FS3728916	William Smith	IV
William M Smith, MD	100 Main St, Aurora, CO 80045	Tom Jones	Expired	300 Main St, Aurora CO 80045	Tramadol 50 mg	Tab No 30
	i TID prn pain	Refill 6 times 5 refills in 6 months	Yes _ No x	FS3728916	William Smith	IV
William M Smith, MD	100 Main St, Aurora, CO 80045	Tom Jones	Expired	300 Main St, Aurora CO 80045	Tramadol 50 mg	Tab No 30
	i TID prn pain	Refill 5 times	Yes _ No x	FS3728916	William Smith	IV
William M Smith, MD	100 Main St, Aurora, CO 80045	Tom Jones		300 Main St, Aurora CO 80045	Tramadol 50 mg	Tab No 30
	i TID prn pain	Refill 3 times	Yes _ No x	FS3728916	William Smith	IV
William M Smith, MD	100 Main St, Aurora, CO 80045	Tom Jones		300 Main St, Aurora CO 80045	Tramadol 50 mg	Tab No 3̶0̶ 40
	i TID prn pain	Refill 5 times	Yes _ No x	FS3728916	William Smith	IV
William C Black, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Vicodin 5/325	60 Invalid Quantity (Max 7 days supply)
	i q 4-6 hours prn pain	No Refills	Yes x No _	BB3216226	Bill Black	II
William C Black, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Vicodin 5/325	30
	i q 4-6 hours prn pain	1 Refill Schedule 2 - No Refills	Yes x No _	BB3216226	Bill Black	II
William C Black, MD	Missing Doctors Address	Bill Jones		200 Main St, Aurora CO 80045	Vicodin 5/325	30
	i q 4-6 hours prn pain	1 Refill Schedule 2 - No Refills	Yes x No _	BB3216226	Bill Black	II
William C Black, MD	Missing Doctors Address	Bill Jones		200 Main St, Aurora CO 80045	Vicodin 5/325	30
	i q 4-6 hours prn pain	No Refills	Yes x No _	BB3216226	Bill Black	II
William C Black, MD	Missing Doctors Address	Bill Jones		Missing Patients Address	Vicodin 5/325	30
	i q 4-6 hours prn pain	1 Refill Schedule 2 - No Refills	Yes x No _	BB3216226	Bill Black	II
William C Black, MD	100 Main St, Aurora, CO 80045	Bill Jones		Missing Patients Address	Vicodin 5/325	60 Invalid Quantity (Max 7 days supply)
	i q 4-6 hours prn pain	1 Refill Schedule 2 - No Refills	Yes x No _	BB3216226	Bill Black	II
William C Black, MD	Missing Doctors Address	Bill Jones		300 Main St, Aurora CO 80045	Vicodin 5/325	30
	i q 4-6 hours prn pain	1 Refill Schedule 2 - No Refills	Yes x No _	BB3216226	Bill Black	II
Dr Name	Dr Address	Pt Name	Expired	Pt Address	Drug Name	Number
	Sig	Refills	Generic	DEA	Signature	ClassUS
William C Black, MD	100 Main St, Aurora, CO 80045	Bill Jones		200 Main St, Aurora CO 80045	Vicodin 5/500	30
	i q 4-6 hours prn pain	No Refills	Yes x No _	BB3216226	Bill Black	II

Current List of Requirements
US Prescription Requirements for Scheduled Drugs
Extracted from: http://accesspharmacy.mhmedical.com/book.aspx?bookid=1354
Requirements / State	US Federal	Arizona	California	Colorado
Schedule 2 Refills	0	0	0	0
Schedule 3 Refills	5	5	5	5
Schedule 4 Refills	5	5	5	5
Schedule 5 Refills	5	5	5	5
Schedule 2 Expiry	12 months	90d	6 months	12 months
Schedule 3 Expiry	6 months	6 months	6 months	6 months
Schedule 4 Expiry	6 months	6 months	6 months	6 months
Schedule 5 Expiry	6 months	1 year	6 months	6 months
Schedule 2 Quantity Change - Flag?	No	No	No	No
Schedule 2-5 General	Drug name, strength, dosage form, quantity, directions, refills authorized	Drug name, strength, dosage form, quantity, directions, refills authorized	Drug name, strength, dosage form, quantity, directions, refills authorized	Drug name, strength, dosage form, quantity, directions, refills authorized

Notes		CII: One drug per prescription
From Federal		Additional CI-V items

Contact: David Bourne david.bourne@ucdenver.edu for more information, suggestions and corrections.