You can buy it here: http://www.koobi.com/koobicyclingjersey-2.aspx
Maybe the relevant law in the Maryland Code should be printed on the back in fine print:
Transportation § 21-1209 (a):
(2) When overtaking a bicycle, an EPAMD, or a motor scooter, pass safely at a distance of not less than 3 feet, unless, at the time:
(i) The bicycle, EPAMD, or motor scooter rider fails to operate the vehicle in conformance with § 21-1205(a) of this subtitle (“Riding to right side of roadway”) or § 21-1205.1(b) of this subtitle (“Roadway with bike lane or shoulder paved to smooth surface”);
(ii) A passing clearance of less than 3 feet is caused solely by the bicycle, EPAMD, or motor scooter rider failing to maintain a steady course; or
(iii) The highway on which the vehicle is being driven is not wide enough to lawfully pass the bicycle, EPAMD, or motor scooter at a distance of at least 3 feet.
In other words, drivers have to give you 3 feet of clearance unless 1) you’re riding further left than you’re allowed to, 2) you’re not holding your line, or 3) the road isn’t wide enough to allow 3 feet of clearance. The last one weakens the law considerably, meaning that on two-lane roads with narrow lanes (like MacArthur Blvd.) drivers are allowed to get much closer to you.