A Michigan teen who was ticketed — as a passenger — for balking at taking a Breathalyzer test says that she refused because the detective did not have a warrant. Now 17-year-old Casey Guthrie has filed a federal lawsuit against the cop who slapped her with the $100 citation last month. The honor student is also challenging the constitutionality of a Michigan law that makes it a civil infraction for anybody under age 21 to refuse a police officer's request to blow into the device — and does not require the cop to produce a warrant. "No adequate remedy exists...