Source: "I watched Britney let a guy do a line of coke off her chest"

Britney HAS been into drugs before she lost the kids and as far as we know, she also HAS been passing her random drug tests thus far, but what really happened the night she lost her kids on October 19th is a big mystery.

According to INTOUCH, following her court session, Britney and friends headed to her house and did coke into the night.

Two witnesses tell In Touch exclusively that just hours after she lost custody of her sons, Sean Preston and Jayden, Britney was out of control drinking and snorting cocaine during a wild party at her Beverly Hills mansion. “I watched Britney let a guy do a line of coke off her chest,” LA musician Scott Kohler — who was at Britney’s house until the sun came up on October 19 — tells In Touch.

The next morning she passed her drug test with no problems … guess someone is lieing here…