I think the chum laws are in place because fish parts(mainly the entrails) promote algea growth, especially in areas that arent swept out by current. This is why you dont see fish cleaning houses at resorts next to the water. In many states, its very popular to have a fish cleaning location next to the water and you just toss the remains in the water… usually backwaters in a cypress swamp or area similar.
Personaly.. I think its stupid when it comes to the river. The guts of our bait is what holds the most scent, draws fish in, and entices them to strike. I dont think there is anywhere entrails could enter the water and not be sucked up by a fish.. ALL species of fish, or other aquatic scavenger critters.
This is why it works better during ice fishing to use the head section of a fathead(or any minnow) vs the tail section.. more scent/flavor.
The pill bottle with holes in it attatched to the line should be legal and seems like a great idea for channel cats. I wonder how many times the fish grab the bottle and not the bait?