If they are in properly labeled prescription bottles, it is 100% none of their business. If you are traveling with them in 7-day containers, carry the original prescription bottles with you. If, incidental to a proper search for weapons, incendiaries and explosives, they notice evidence of illegal drug trafficing or possession, they will refer it to law enforcement. The first point is that they can't go looking for drugs, and the second is that properly prescribed medications can't possibly be evidence of illegal drugs. Simply put, your prescriptions are none of TSA's business. Only if they are in liquid or gel form in quantities > 100 ml. or if they won't fit in your normal 1 quart baggie do you have to submit them separately.