If it were indeed a call from a the Trooper Fund. the callers keep 70% of all proceeds and the Troopers get the remaining 30%.
If you want to donate to the Troopers' Fund, stop a Trooper and write out your tax deductible check to them and he will make sure they get 100% of your donation. (Alabama State Trooper Association)
The FOP sometimes use the same type fund raisers and I was a member until I retired but I do not approve of these type fund raisers.