I saw that the WI DNR has established an anti-poacher hotline. Not a bad idea, and especially nice to see that (as with similar hotlines) the state readily embraces a principle of anonymity:
Help the wardens protect your natural resources and wildlife from poachers and violators. If you see anything suspicious during the pending 9-day gun deer hunting season, call the DNR Violation Hotline at 1-800-TIP-WDNR, or #367 by cellular (free for U.S. Cellular customers).
You also can text: TIPWDNR [space], followed by the tip to 847411 (tip411)
You can remain anonymous. This hotline number is staffed 24 hours a day, every day.