I carry around a pill case too. Usually for my Klonopin or Adderall. I do sometimes worry/wonder about what would happen if I had some kind of interaction with the police and they found me with controlled substances outside of a prescription bottle(or even in a prescription bottle, actually). They could claim that you're selling or bought them illegally.

Also, have you heard of DRE police? They can arrest you and charge you with DUI prescription drugs from a simple visual observation! Antidepressants and stimulants fall under the category of precipitating impairment.