In the Northeastern states of CT, NJ & NY there are restrictions and out right bans on using pesticides on school grounds.
Sports turf managers now have to depend heavily on cultural methods such as aeration, seeding, mowing and irrigation to reduce weed pressure. Pre-emergents and most blanket treatments are restricted or banned. Until very recently there was no selective post-emgerent product for broadleafs or crab grass.
It's a whole new ball game here.
The nation that destroys its soil destroys itself.
Franklin D. Roosevelt