GURNEE, Ill. (CBS 58) -- Six Flags Great America and sister water park Hurricane Harbor near the Wisconsin-Illinois border will adopt a summer-long chaperone policy starting Thursday, July 17. The policy will be in effect all day from Thursday through Sunday. 

Guests under 15 years of age must bring a valid, government-issued ID, including date of birth, at entry. After Sunday, kids under 15 will be required to bring a chaperone over 21 years old to remain in the park after 5:00 p.m., according to the park's current updated regulations. 

The reactivated chaperone policy comes a week after CBS News confirmed there were shots fired in the parking lot outside of the amusement park grounds. 

To learn more about Six Flags' policy on chaperones, you can visit their website here.