Yes for urine, no for blood. While on probation in Travis County, you will be submitting breathalyzers and urine specimens that test for the use of drugs and/or alcohol. Fortunately for a lot of folks, the cost of blood tests are prohibitively high for the county.
In practice, urine tests are the only test used. In theory, and I would not want to be the one to push the envelope on this, blood tests and hair sample tests are possible. More likely is the un-announced home or workplace visit by your PO.
This answer is intended to be taken as general information and not as specific legal advice. You should always consult a qualified attorney and make him familiar with all the relevant facts in order to get proper legal advice. Every case is different, and they must be evaluated on a case-by-case basis. David N. Smith 812 W. 11th Street, Suite 201 Austin TX 78701 (512) 457-0100 defenseattorneysmith.com