This is not a question for criminal defense lawyers because you're not a suspect in a criminal case, but being a family law lawyer I may be able to help you. The Department of Children and Families has the right to "place" children in the State's care, and to screen those individuals to see if they are appropriate "placement parents" or "care givers." So once the children were "sheltered," they were then in the custody of the State of Florida, and the State apparently wants to make sure you have a drug-free environment for the children. Now, if you refuse to take the test, will DCF automatically remove them from you? Not necessarily. They will look you over and wonder about it, and they MIGHT take them, or, they might look you over and say, no, let's leave them with him. But the worse thing that can happen to you is they take the kids and place them with some other care giver. DCF won't do anything else to hurt you. Call if you'd like further information.