Megan,
Some background information re Police Aviation in the United States......one thing it mentioned is the number of police units that exist in the Country that will demonstrate why it is as most things here....is a complex situation that involves the many political jurisdictions (Federal Government/State/County/City that are operators of "police helicopters/airplanes.
https://www.police1.com/police-produ...7lrP04E5tC6lq/
The leading association for the Police Aviation Sector has recently changed names and has about 3,000 members.
This link will take you to the Safety Page at their website which will provide some background to how professional organizations have been formed to improve the many police units around the country.
Just as in the EMS aviation sector....the Police have focused efforts on improving the safety of member operations through training and education.
These groups are quite similar to the efforts by the HAI for traditional utility and air taxi operators.
There are magazine articles that are linked within the web site that can be accessed for reading.
https://publicsafetyaviation.org/safety-menu