Britney Spears' lawyers have accused the singer's former manager, Sam Lutfi of 'wrongful retention' of her drug test results in 2007.

Britney Spears

The results were ordered sealed as Spears was embroiled in a bitter custody dispute at the time with ex-husband, Kevin Federline, and Lutfi wants to use them as exhibits in the upcoming trial, where he sues the pop star and her family for breach of contract and defamation.