I hate to break this to you but as a FLETC certified firearms instructor they very much follow Ernest Langdon maxim that the best teachers are the best thrives. Much of what they were teaching 10-15 years ago was ripped off from places like Mis-South and the Rogers School. They may be ripping off new material but I doubt the process has changed much.
My own Agency firearms unit has man crushes on certain trainers and unsurprisingly those same trainers drills show up in our materials.