. >> cheryl hurd is in san francisco with this very unusual story. >> so we do have surveillance footage of him, you know entering the office as well as him leaving the office. >> reporter: and that's the only thing they have, because this man left without paying his $6,000 bill for three treatments. >> botox, which treats wrinkles fillers, which also treats aging, and then a laser treatment. >> reporter: he followed his personal protocol. he'd met with the patient here in this office. they talked about procedures but looking back dr. fan says he got a hunch the client was not forthcoming. >> a little bit secretive and a little bit private sort of coming into the office. >> reporter: he was given a name, paul halford an and age, 43. he gave the address, 1140 folsom and turns out to be an office building. fan usually asked for a credit card but the client showed his assistant a wallet full of cash. >> also seemed to know quite a bit about what he wanted done and so looking back there were some red flags. >> reporter: another red flag this e-mail from a local representative who sells botox