The meaning of 'Breath test'

[Jesus1]

Hello, How is it going?

Does 'breath test' mean the test you must
do when the police stop you in order to
know if you?ve been drinking more
alcohol than it?s allowed to?

Thanks a lot!

Jes?s

[Yankee]

.
That's probably the meaning, Jes?s. And such a breath test is done using a device called a breathalyzer:
http://www.howstuffworks.com/breathalyzer.htm

I think there are medical breath tests for other things as well, however the breath test for alcohol is certainly the most well-known (and probably most often done . )

Amy