I edited the Practice Section to FAMILY law, so attorneys may respond to your post. Contact a family lawyer for advice and direction.
I am trying to give you a general answer to your question. We do not have an attorney-client relationship by this response on the avvo website. I have not been retained to represent you. I am licensed to practice law in Kentucky and in federal court in this state and the Southern District of Indiana. You need to seek legal advice from an attorney licensed to practice in your area..
You do have a problem. What got CPS in the door may be explained but what they saw once they got in will keep them around. Bottom line is any illegal substance use in the home will be grounds for CPS to be in your business. You need to understand that there is no such thing as a "small amount of marijuana" for CPS. Either you are a user or you are not. You have a choice to make. Its your kid or your habit. You might not lose your kids after a first failed drug screen but all that does is give CPS grounds to stick around.