When drug use is an issue in a case, many Judges will order a drug test as a condition to visitation. Once a clean drug test is produced, then visitation can progress. The most common testing facility used by Judges in Travis and Williamson Counties is Austin Mobile Drug Testing. They offer hair and nail testing as well as the more standard tests and substance abuse assessments. The easiest and quickest way to get a test done is to contact them before arriving at their Round Rock location: 512-507-5983, 402 West Palm Valley Blvd, Ste. H, Round Rock, TX 78664. If you know drug use will be an issue in your case I have always found it better to come to court with your recent test results in-hand and ready to show the Judge.