I never heard of it. It isn't listed in the Standard Catalog and I don't recall seeing in in any of my Ebay searches. Chad was nice enough to send me one of three sets he picked up at a bargain price at a garage sale.
It turns out that this is a fairly rare set. The ISP issued the cards as part of their Violence Education Gang Awareness program. One site I found said the cards were only available at a Cubs / State Police fundraiser. There isn't very much out there at all about these.
The cards are over-sized, at 3½" x 5½". They are printed on fairly thin card stock. The fronts have the name of the player and the ISP and Cubs logos. On the back there is limited information about the player. Most of the back is dedicated to listing six steps to solving a conflict.
There are 32 cards in the set, including the manager and six coaches. There are many more unknowns than name guys among the players. It was really surprised when I saw that the 1995 Cubs finished in 3rd place, two games over .500.