Here is a scenario that could arise: You and your spouse are driving on the interstate. To avoid an object in the road, you swerve. A policeman behind you sees you swerve, but doesn’t see the reason why, and he decides to pull you over for reckless driving.
As the policeman approaches your vehicle, your full-time RV, you lower the window and hand him your driver license. The policeman asks to search the RV.
Can he? He must have probable cause to search.
Is swerving enough of a reason for him to search your RV? Yes, it is.
In a moving vehicle, if the policeman can show probable cause that the vehicle contains evidence of a crime, he can search without a warrant.
So, the police, seeing that you have swerved and believing that you might be “under the influence,” can search your RV. When they discover the pill box where there are drugs not in the container in which they were prescribed, they have already found enough evidence to cause you to worry.
They will ask what each pill is for, where it was prescribed and to produce the doctor’s prescription. You would have the burden of proving that you had a prescription and that you had followed the directions. If there are precautions against driving after taking the drug, more problems may develop as you try to explain that you have, or have not, taken the drug.