In most states (I can't be certain of every one), the breathalyzer the cop has in his car is not a real breathalyzer. It is called a PBT (preliminary breath test), and you can absolutely refuse to take it without any legal penalty. That's because they are pathetically inaccurate and not admissible in court. However, the real breathalyzer back at the police station is very accurate, is admissible, and if you refuse to take that one, THAT is when they take your license. And that is the test that the "implied consent" laws are talking about.
And also in most states you can absolutely refuse any other type of field sobriety test (standing on one foot, walking a line, etc) without any penalty as well. Know your rights peeps. But check the laws in your state, don't just take my word for it
