I can be open or closed, or big or small. I can reveal the truth or hide it. I am almost always welcome and can spring up unannounced. Everyone has one, but not everyone shares. Laughter comes after me. What am I

What federal law makes marijuana illegal i know it's a schedule 1 drug but what law specifically gives the federal government the ability to arrest or fine you over marijuana i have only been able to find info on the scheduling of the drug but it never says this or that is illegal it just says that it's a schedule 1 drug i need the wording exactly my english teacher says that if i don't have it my paper is null and void