Simply to gain more “evidence” to use against the driver in order to arrest them and later make the charges stick. They do use breathalyzers but usually ask the driver to perform FST’s first to gain more leverage as the police need two different “reasons” to assume someone is under the influence of alcohol (I.e. the traffic violation AND failing one of the tests). IIRC they cannot ask you to take a breathalyzer if you simply made a small traffic violation, so instead they will use these tests to rationalize using a breathalyzer as the tests are really hard for even a completely sober person to “pass”. These tests are also NOT MANDATORY, and you should ALWAYS refuse to take any tests.
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