Section 35 of a Part 107 waiver is needed to legally operate multiple small aircraft like the group of drones described in the article. The only 107.35 waiver issued in Colorado was to Lockheed Martin:

https://www.faa.gov/uas/commercial_operators/part_107_waivers/waivers_issued/media/107W-2017-05310_Matthew_Granger_CoW.pdf

Lockheed Martin is obviously large military aircraft (and other equipment) contractor. I find it funny that the Police specifically say it's not the federal government, which would still technically be true if a contractor was doing it on their behalf. Of course, these could also be operated by someone from out of state (ie. dozens of 107.35 have been issued in California) or from someone without a waiver at all.