norman welsh. little do they know the tables are about to be turned on them. let s see the salad. reporter: the salad he s talking about is cash. informant carl mareno had a secret camera rolling as butler counts out $10,000, cash he said he delivered for a pound of crystal meth. i tried to get the shot with both of them in it also. i just wanted to make sure there was no doubt what was going on. reporter: mareno watched the video for the first time with us, remembering how terrified he was as he pointed the hidden camera at one of the east bay s top cops. i never videotaped him, and i m using equipment that he s very familiar with. it s from his own department, and if he realizes i m doing that, i just know it s not going to be good for me. reporter: and welsh does sound worried, asking mareno if he s sure his buyer can be trusted. he obviously knew that stepping up to crystal meth was a big step as far as charges and sentencing and everything else, and he was