Is anyone very familiar with the entry criteria for rehab clinics/other similar institutions? What proof, if any, must you provide of being an alcoholic or a drug addict? It seems absurd to think that you'd need it, but I'm not sure.
Basically one of my characters has reason to believe that a man he's tailing has checked into the facility. Would he be able to check himself in, masquerading as an alcoholic, in hopes of observing the guy?