Last reviewed Oct 26, 2026. General information, not legal advice.
Random testing is one of the main ways DOT rules keep drug and alcohol use off the road. Here is how it works in plain terms.
The basics
Every covered driver is placed in a pool. A few times a year, names are picked at random from that pool. Each driver has the same chance of being picked every time. You can be picked more than once in a year, or not at all.
The government sets the minimum share of drivers that must be tested each year. Those rates can change, so check the current numbers each year.
What happens when you are picked
- Your employer or consortium tells you that you were selected.
- You go for your test right away. You should not delay.
- You give a sample at a collection site.
- The result goes through the normal review process to your employer.
Not showing up, or delaying on purpose, can be treated as a refusal. A refusal has the same consequences as a failed test.
Owner-operators
If you run your own authority and drive yourself, you cannot pick yourself at random. Instead, you join a consortium. The consortium puts you in a larger pool with other drivers and runs the random picks for you.
Keeping it simple
Our random testing consortium handles the selections and tells you when you are picked. You can also read about the FMCSA Clearinghouse for owner-operators.