Lowes hiring process question?

I had my first and second job interview today for a position at my local lowes store, im waiting for the third with the store manager and then my background and drug test, i dont use illicit drugs but do take prescription medication ( it is prescribed by my doctor), so when i have the saliva drug screen should i have my prescription bottles with me to show the tester? they do the tests in the lowes store. please help me i need to know the proper ettiquite for this.