Can Breath Blood or Urine Tests Be Challenged?
Yes they can.
There are many ways to challenge those kinds of tests depending on what type of test it is. For example, a breath test, you can challenge the legitimacy of the machine. On a blood test, you can challenge the way and the reasons that they drew your blood. On a urine tests, there are chain of custody and other issues related to that which you may be able to challenge whether urine samples come in along with blood samples and breath samples.
Yes. In all the situations, they can be challenged.