BOULDER, Colo. -- Former "Family Ties" child TV star Brian Bonsall is in trouble again -- this time over drug tests that allegedly showed he has used marijuana while out on bond.

Brian Bonsall, 28, was out on bond after being charged with third-degree assault and failure-to-appear in Boulder. During a court appearance on Friday, he was arrested after the prosecutor said he violated conditions of his bond.

Deputy District Attorney Amy Okubo said Bonsall tested positive for marijuana in a Feb. 15 urine test and had several other diluted urine tests. Okubo said he believed the reason the urine tests were diluted was "because he was trying to hide drug use."

Bonsall's attorney said his client had applied for a medical marijuana license, although it wasn't clear if he already had one. The court-appointed attorney said Bonsall is a candidate for medical marijuana due to severe head injuries he has suffered.

The original assault charges stem from an alleged incident involving a friend of Bonsall who said he was hit in the face with a stool.

Okubo said one of the conditions of Bonsall's bond were "no drugs."

Bonsall, who is a member of a band now, starred as Michael J. Fox's little brother Andy Keaton in the 1980s-era TV sitcom "Family Ties."

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