It registers as Texas Troopers Assoc.  I treat all phone solicitors as a scam.  Wouldnt give one red dime to someone calling me.  Could be legit, but my guess it's not.  It's a shame, because I'm sure there are some good people out there.  It's just that the scammers screw it up for everyone.

Yes it is a "donations" scam that has nothing to do with Texas Troopers or any valid law enforcement org.

Got a call pushing for $100, eventually lesser amounts, but no less than $20.

That's a solicitation to get you to donate money to the Texas State Trooper's Association. This is run by a fundraising company that's been in trouble with the state:
http://tsta.affiniscape.com/associations/8773 ... inst%20TMPA.pdf

Basically they keep most of the money. If you want to help out local law enforcement support groups, I would suggest you do your own searches and research and pick a good one ... don't rely on cold-call telemarketers.

The link you posted is in regards to the 'Texas Highway Patrol Association', but you stated it was the Texas State Troopers Association...two different organizations