If some of the comments I have seen here are any indication, there are a sizable number of people who mistakenly believe that field sobriety test results are necessary for a drunk driving arrest. Those elite few believe that they have the system figured out. According to them, without the results of some sort of field test (either PBT or SFST), even the most sloshed of drivers gets sent on their way. Well, that's not how it works.