The Wednesday before Thanksgiving, or Thanksgiving Eve, is known as the busiest drinking night of the year.
Many people have the holiday off while others are returning to hometowns to visit with family and friends and everyone celebrates with an adult beverage.
In turn, law enforcement will be out in full force to catch those drinking and driving. 
Cape Coral Police will use a gadget called a preliminary breath test, or PBT. It costs between $500 and $750. 
Whether its a can of beer, a bottle of water, or a shot of liquor, the PBT can smell it, and detect if the particular liquid is positive or negative for alcohol.
"There's a fuel cell in there that actually will detect ethanol or ETOH which is the actual alcohol that's used in beverages," said Master Sgt. Allan Kolak, with the Cape Coral Police Department. 
The NBC2 Investigators wanted to see how the PBT worked so we teamed up with CCPD.
First, we tested a can of beer. We poured the beer into a cup. We held the PBT over the cup. A 'Positive' reading appeared.
Then, we tested a bottle of water. We held the PBT over the bottle. A 'Negative' reading appeared.
Then, we poured some vodka into the same water bottle. We held the PBT over the bottle. A 'Positive' reading appeared.
So when would a Cape Coral Police officer use a PBT? 
Typically on drivers under the age of 21 if the officer believes the drivers have been drinking, which would violate Florida's Zero Tolerance Law, or if there's an open container in the car.
PBTs have been excluded from criminal cases in Florida so Kolak said its officers would not use them to build probable cause.
"If the officer believes they are under the influence, they would conduct a DUI investigation and the PBT would not come into play whatsoever," said Kolak. "If the person does not appear to be under the influence of alcohol but the officer believes they have been drinking, they would put them on a PBT to determine if they are above a .02."
In Florida, any driver under 21 that is stopped by law enforcement and has a blood alcohol level of .02 or higher will automatically have their Florida drivers license suspended for six months.