I think that I may know why the physician or pharmacist made this recommendation - it is the law (in many states - no federal statute) that you have
ALL of the prescription information with the prescribed drugs. So, if you can manage to make a copy of the prescription label, you
may be covered under that requirement.
One of my co-workers just found this out the hard and expensive way. His wife was stopped for a traffic violation in Bosque County Texas by a deputy sheriff. A nosy Highway Patrol officer stopped by to "assist". He looked into the car and saw her opened purse. In her purse was a pill box - similar to what most people travel with. He decided that he needed to search the vehicle at that point. In that pill box was one pill that was not prescribed to my friends wife - it was his prescription for a sleep aid. This came to light as the HP officer emptied out the pill box on the hood and asked her specifically what each pill was. She also dutifully identified which ones were hers, and which ones belonged to her husband. They had just gotten back the night before from a weekend trip to Austin for a large church festival. At that point the HP officer stated that he was going to place her under arrest and have CPS come and take her kids. That was the point where she firmly stated
that would not happen, and she called her husband to come pick up the kids. Luckily the deputy agreed with her since it was his stop - and they waited. Anyway, she went to jail, and it took a lot of time and money to a defense lawyer to get those charges dropped. It was all silliness to begin with. If my co-worker had left his prescription bottle in her purse, there would not have been any issue at all.
Anyway, this just goes to show the level of pettiness that some LEO's will stoop to. That new HP officer was fast gaining a reputation here in Bosque County, and many complaints by the locals were filed. Eventually the overzealous officer was reassigned.
Texas Controlled Substance, Drug, Device and Cosmetic Act
http://law.justia.com/codes/texas/2005/hs/006.00.000431.00.html
I think that 431.112 (f), (g) and (m) apply, but not sure (based on another law forums posting).
And, they may only apply to narcotics - but it would still be left open for prosecutorial discretion at the county level....