I know I'll be seen as naive by some, and I expect some responses decrying Orwellian doom, but since I don't abuse contraband substances I feel no fear at the prospect of being asked to render samples of my bodily fluids.
I feel that drivers' licenses should be viewed as privileges rather than rights. Judging from observations I've made of the way certain of my fellow cyclists pilot their machines, riding a bike should be seen in the same light.
Basically I hate any behavior that suggests that the driver, rider, or in fact pedestrian feels he/she is entitled to the whole of the road and is heedless to the safety of others.
-Rob (...and then there are those mouth-breathers on the bus! Don't get me started!...)