Forcing Pass system are banned by ACBL not because of the forcing pass opening but because of the fert opening and the artificial limited opening
a Fert opening is a bid that show 0-7 or 0-8 point and is very disturbing for the other side
WEST PASS
NORTH bid 2♣ showing 4+♥ and another suit 11-17 HCP
EAST PASS
SOUTH BID 2♥ giving his partner "support" 3+♥
all PASS
THIS IS A VERY BAD EXAMPLE
but if you look at the diagram you see a good fit in ♠ of East-West that they can not bid
Michel