Britney Shaved Head to Avoid Drug Test?

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Another day, another Britney Spears allegation. According to new reports, Spears reportedly shaved her head earlier this year after being warned that traces of drugs could be found in her hair.

Reports say that her ex-hubby Kevin Federline told Britney that he would be awarded full custody of their two boys after traces of drug use were found in her hair follicles.

"Kevin taunted Britney that even his smoking marijuana near her would leave traces that could be picked up by drug testing," a source told the Daily Mirror.

"He threatened to use that against her in a custody battle.

"After Britney shaved her head, she begged her mum and Kevin to test the hair from the salon – but no one claimed it." Instead, her hair ended up on eBay.

This doesn't sound out of the ordinary for Spears but what I don't understand is why K-fed would make a comment about how he would win custody even though he's a huge pot head.