I wasn't giving advice. And I certainly wasn't recommending people go apply pesticides without a license, so please don't put words in my mouth. At least here in CT, compensation is the key. If you advertise yourself as an applicator, give advice on it and/or do it for pay, they can and will come after you. The target is people doing this for a living, not the neighbor who puts down a bag of weed and feed for the little old lady next door as a favor once a year.
For the record, the only thing I apply is straight starter fertilizer for lawn installs/repairs and I categorically do not apply anything with pesticides to a lawn, not even my own (I do spray my foundation for termites though). For one, I don't have a license, 2 I don't want them stored or used on my property, and 3 I don't want ANY unnecessary exposure to chemicals...I've had my share working on hazardous waste sites for 15 years. Besides, there are just too many stories of pesticides that were once commonly used and thought to be safe, only to be found later to have significant environmental or human health consequences...I'm not taking any chances.
Personally I think it's ridiculous that any homeowner, even a total moron, can go purchase lawn chemicals and apply them without any training or oversight. If they really want to protect our ground water and waterways, they should take all but the most innocuous of chemicals out of the hands of homeowners or at least require some sort of basic education on their use.