Do not take a 'field sobriety' or a breathalyzer test.
Many States police will arrest you on the spot, and through the implied consent agreement that is part of getting your license, revoke that license for refusal to take an evidentiary BAC test. The question is, in that particular jurisdiction, if the field tests are considered to be evidentiary tests.
Some States consider the Horizontal Nystagmus gaze test and the others to be screening tests for probable cause to perform a blood alcohol test which passes the rigors for being admissible as evidence, others do not, but consider them evidentiary tests themselves. Field breathalyzers are often, but not always considered to be screening devices, some give readings that may be accepted by that jurisdiction as proof of DUI.
Tests involving physical movements which can be affected by weather, surface, or the physical abilities of the person being tested should have those issues noted--and especially advise the officer of any disability or condition which might affect the outcome.
The other bugaboo is that in some states (if not all) there is a subjective clause which allows the testimony of the officer that you were visibly impaired, too much so to operate the vehicle, as evidence of DUI--which was mandated by the plethora of new and different intoxicants available for which there is no field toxiclogy screen or test.
Refusal may create more problems for you in the long run than taking the test, and it varies from jurisdiction to jurisdiction. If you drink, even in moderation, and drive, you would be wise to learn the specific rules for your area.
