Is it legal for a roommate to move someone in without the permission of the other person listed on the lease?

Question Details: My friend and I both are on the lease. Can she let people move in without my permission? I mean we already have 1 roommate, so we are sharing 1 bedroom. And now she brought her friend so it's 4 of us in 2 bedroom apartment. I mean I know it's allowed but a random person sleeps on the couch in my living room and stocks her stuff in my room. And that person does drugs so I just don't want here in my apartment because who knows what's on her mind? What can I do about it?

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