Kari Ann Peniche's husband said their child tested positive for meth, and its her fault

Kari Ann Peniche's estranged husband claims the couple's 10-month old baby tested positive for meth, and now he's begging a judge to strip Kari's custody rights claiming the "Celebrity Rehab" star poses a serious threat to their child's health, TMZ reports.

Justin Williams has filed documents in L.A. County Superior Court claiming he took his 10 month old son for a hair follicle drug test earlier this month after he began to suspect Peniche had fallen off the wagon and was using drugs around the child.

Williams says the tests came back positive for meth.

In the docs, filed by his attorney Marlo Van Oorschot, Williams says he was initially concerned because the baby "has a habit of sucking on Kari Ann's hair and clothes and I became concerned that he could be affected by drug residue."

Justin also claims he found evidence that Peniche -- who's struggled with addiction in the past -- had been using drugs in the past two months.

Now, Williams believes the baby is in danger when he is with Peniche, explaining, "I do not want him to continue to be exposed to smoke from meth or to accidentally ingest illegal drugs while with Kari Ann."

Williams demanding sole legal and physical custody and wants to ban Peniche from any sort of unsupervised contact with the child. He also wants Peniche to submit to weekly drug tests, and if she tests positive, he wants the judge to revoke her visitation entirely.

Peniche had no comment to TMZ.