British Columbia license issues

[deweydb]

British Columbia uses a very slightly different version of the AAMVA barcode format. Instead of the constant % they use a 2 character constant _%
Described in their documentation here: https://www2.gov.bc.ca/assets/gov/health/practitioner-pro/medical-services-plan/teleplan-v4-4.pdf (in case this link dies, i am also attaching the PDF here.
teleplan-v4-4.pdf

At the bottom of the rear of the card, all of the cards are personalized with an unencrypted 2D barcode in the PDF417 encoding format. The data format and data fields for all of the cards, including the BC Services cards, match the Driver’s Licence AAMVA specification magnetic stripe format defined in the “CARD SPECIFICATIONS – COMBINED CARD” section, except for Track 3, Field #1 which includes an underscore in the barcode, for example, Constant “_%”..

This shifts the characters over by 1 character for the fields:
height, weight, hair & eyes.

My suggested fix is:

		if state == "BC":
			offset = 1
		else:
			offset = 0
		
		height = track3[31+offset:34+offset].strip()
		weight = track3[34+offset:37+offset].strip() #lbs for US, kg for CA/MX
		hair = track3[37+offset:40+offset]
		eyes = track3[40+offset:43+offset]