Does your local race association allow the use of the IAB technique

a few of our A riders(Cat 1's) were using them in a local crit and there was a commisaire who was there and teaching a class she said that we should stop allowing racers to use the technique because it is not safe.

subsequently I believe we were warned at other races but not all

the lady teaching the course is very experienced and has worked the Tour de France form what i was told