I hesitate to wade into this topic, but it seems that there are some basic questions left unanswered or asked here.
If this was truly public land, compared to private land, bait pile placement might be very hard to stick to any one individual who was not caught red handed with the bait...and even the fact that there was bait there...if it was visible, or not, or if still a "viable bait pile" by the time YOU hunted over it...or near it would be a tall order to prove.
If you gave up information and volunteered self incriminating statements, then you may well have provoked the agents to stick you with the violations.
Assuming you did NOT volunteer shooting over the bait, and assuming this was public land, where you might not control the use of the "stand" blind, or whatever it was that you were hunting from, this is going to be a tough one to prosecute. Even though the rules favor the "presumption" that you knew that there was bait there, in a court of law this is going to be hard to prove compared to hunting in a private blind or private property situation.
For a judge to find against you on this, he would have to be satisfied that YOU knew the food was there first....and he would have to be satisfied that you did hunt there knowing that someone...anyone ...put the food out there.
Even though there are rules against hunting over bait, these rules need to conform to established basic legal rights everyone has that assumes you are innocent until proved reasonably that you violated the rule and that the rule is NOT unreasonable.
However, in the real world, you might be innocent, but the preponderance of evidence is enough for any prudent judge to find you guilty of the infraction.
And even if you are innocent, by the time you spend the bucks on an attorney to prove your innocent, you will very likely spend more than had you paid the fine to begin with.
I can see this one getting plead out to a lesser charge with any "retroactive" charge from the previous season, being thrown out for lack of evidence.
Two points were brought out here that need adding to.
One is that you usually say too much which puts you into trouble. Be cooperative, but don't volunteer more information than that which you were asked to provide. Don't elaborate.
Secondly, NOBODY can sign away their legal rights...by signing any license, or contract or any other document that removes your basic legal rights. That act itself is against the law and it is very unlikely a judge wouldn't agree with this.
If you get a fair judge who doesn't just rubber stamp what the officers submit (which is always a possibility), you stand a good chance of getting this one reduced to something far less damaging if not tossed completely.