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Unfortunately, if the parent is found to be using any illegal drugs by the Child Protective Services, then in fact the state agency can require such parent to comply with a drug treatment and get regular drug testing and if the parent does not comply, then the state child protective agency can in fact remove the children from the parent or anyone related to the parent who has temporary legal guardianship and place children in foster care, while filing a petition for termination of parents rights against the parent.
The reason state child protective services have authority to do that, is because the law gives the state agency authority to protect welfare, safety and health of minor children and if the agency determined that a parent is using illegal drugs, that is considered an unsafe situation for the kids and the agency has to take corrective measures which can range from requiring for the parent to attend drug treatment to terminating parental rights, if the parent fails to comply.
So it is generally very important to comply with any requirements that Child Protective Services might place, since non-compliance can potentially result in a loss of parental rights.
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