Blood test are becoming an increasingly prevalent method of measuring a person's alcohol concentration in DWI cases.  In fact, in 2009 the Texas Legislature passed an expanded blood draw statute which significantly expands the authority of police to compel a blood sample, without consent and without a warrant.

Generally speaking, blood tests are more accurate than breath tests.  To defend against them, it is important to have an experienced DWI attorney who is familiar with the intricate law concerning blood draws, as well as the science regard the collection, storage and analysis of the blood.

If you submitted to a test, you have the right to an independent analysis.