Furthermore, urine alcohol concentration does not correspond directly to blood alcohol concentration. Urine alcohol levels vary depending on the individual's metabolism and the amount of fluid in his system. For example, a person who is dehydrated will tend to have a higher alcohol concentration in his urine than someone who has a normal level of fluid in his system.

Testing Methods

Breath Alcohol Tests - It is well proven the there is a direct correlation between a person's blood alcohol concentration and his breath alcohol contents. There are several kinds of breath analyzers available. The kinds of testers fall into three categories:

Evidential Breath Tests (legally admissible)
Non evidential Portable Hand Held Devices
Disposable Devices (provides less accurate, non forensic results)

Test Strips, Cassettes, Kits - The disposable devices are noninvasive, less accurate and non scalable methods of urine alcohol drug testing. The cost per test is much higher than the cost of testing using portable, digital devices.