Two questions about driving

Hi all. Got accepted last week and received my first alternaleaf prescription yesterday. Part of the reason for going legal was to help with concerns over driving. I wouldn't drive impaired but I understand that cannabis can stay in your system the following day and beyond. I am probably overthinking this but keen to hear from others.

Question 1 - do people take their prescription details or even the product with them each time they drive in case they get pulled over and tested, which might show positive from the night before??

Question 2 - I know that having a alcoholic drink whilst holding a prescription is a No-No when you're driving. Does this effectively mean you can never have a beer and drive if you've had cannabis the night before??

Thank you.