Seven months after a 9Wants to Know undercover investigation highlighted open drug use and dealing inside and around the city’s main library, calls for overdoses have dropped.

The investigation prompted police to patrol the library grounds nearly every day after the investigation showed undercover video of people using heroin just outside the library’s door.

A meth exchange inside the teen area was also captured on camera during the initial investigation.

City Librarian Michelle Jeske said the police presence has improved the environment around the library.

“Really just making more a visible presence that they’re inside the building, and walking around as well. We think that’s been very helpful,” Jeske said.

A review of 911 calls made from the library show the number of overdoses has dropped about 47% since the first story aired in May.

During the first half of 2017, the library experienced a spike in heroin overdoses, including a fatal overdose after a man was found in one of the facility’s 15 bathrooms.