Hello, I apologize if this has been asked before but I would like to know what the law is on having certain drugs in your system.

I live very close to the Canadian border, tomorrow my mom and I are going to go there and get a couple bottles each of tylenol w/ codeine. My mom has done this for several years and has never been hassled about it at the border and always declares what she has.

But what is the law about having codeine in your system? For example if you were given a drug test and you have codeine in your system would you get in trouble?

If you get pulled over with codeine in your car would you get a ticket?

Thanks to anyone who answers!