That is absolute BULLSHIT about being a gun "owner" simply because you steal a gun! 

Halloween is coming, if I dress as a Doctor can I operate on you?

Stealing a Ferrari and riding around doesn't mean I own the car! It simply means I stole the car! 

If I break into your house does that make me a joint homeowner with you? 
You never answered my question - have you ever taken pills of any kind for a headache or medicine for being sick? The you are a drug user and if you shared any aspirin the you are a drug dealer.