If someone hasn’t smoked marijuana for about 5 years, can still it be detected in a test?

And what is the difference between Meth and Crystal Meth?
It’s for school, I don’t plan on taking any drugs soon people.

Our RA came in and i hid our bong in my backpack without realizing there was still water in it. some spilled out and now all my books and backpack smell like bong water. anyone know how to get the smell out?