Some unusual police roadblocks were set up on Friday, Saturday and Sunday in St. Clair and Bibb Counties in Alabama. Law enforcement asked motorists to give blood and DNA samples.
While the request was voluntary and motorists were paid for their bodily fluids, some might have felt pressured to give up the samples with the request coming from police officers.
However, law enforcement is claiming that the request is perfectly normal.
"They were here in 2007," said Lt. Freddie Turrentine of the St. Clair County Sheriff's Department to AL.com. "It's just with social media and Facebook now, word of it has just exploded. It was completely voluntary. If they didn't want to take part, they could drive off."
Turrentine added: "They were taking the samples in other parts of the country. They want to find out of all the people surveyed, how many people were driving with alcohol in their system, or prescription drugs, things like that."
Turrentine said the blood samples were taken for a study by the Pacific Institute for Research and Evaluation.
Law enforcement officials claim that the roadblocks were marked with signs stating it was a paid survey, but that seems to contradict one picture of the roadblocks (above).
Drivers were offered $10 for a mouth swab and $50 for a blood test.
However, Jose Ucles, a spokesperson for the National Traffic Highway Safety Administration, claims that the survey did not collect DNA, which contradicts law enforcement.