British singer Kerry Katona has refused to undergo drug tests to prove that she is fit to take custody of her two kids.
The 26-year-old is involved in a custody battle for Molly, six, and Lily, four, with ex-hubby Brian McFadden.
Lawyers sought evidence to show that Katona is clean, after reports revealed that she is suffering from alcohol and drug problems.
"Brian thinks her refusal is as clear as any test result," News of the World quoted the source as saying.
The kids are staying with the 'Westlife' star, who has refused to discuss the custody battle.
"I don't have any worry about the kids now because they are with me. But I can't speak about the custody battle for legal reasons," he said.
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