SCOTTSDALE, AZ - As always, the crowds at the Waste Management Phoenix Open are loud and proud, especially at night at the Bird's Nest.
Making their way through the crowd are Scottsdale police officers giving some party-goers a wakeup call.
Many of the people at the party came from the Open earlier today and have been drinking for hours.
Police have been warning people all day, if you've been drinking, don't drive.
They're offering breathalyzer tests to people leaving the Phoenix Open, part of the "Know Your Limit" campaign.
The goal is to educate people and keep drunk drivers off the road.
This is the third year the Scottsdale Police Department has offered the tests and so far the results have been positive.
"The first year that we did it we had about a 120 arrests for the event, or week, and we did about 600 tests for that total for the week," said Sgt. Tom Jensen. "So the next year we did it, last year, did roughly 2,100 tests and we did about 60 arrests that week."
Scottsdale police and other police agencies are beefing up patrols this weekend. Less than a mile away from the event, police have a DUI checkpoint.