To control feral pig numbers, American hunters have taken to trapping and/or killing as many individuals as they can. Some, in Texas, have even turned the trapping and killing of razorbacks into small businesses.[23][24][25] Legal restrictions on methods of hunting are lax, as most state departments of wildlife openly acknowledge feral pigs as an ecological threat and some classify them as vermin. For example, in Wisconsin, the DNR considers them unprotected wild animals with no closed season or harvest limit, and promotes aggressive removal.[26] Hunting with dogs is permitted and very common; it has been practiced in the Southeast for generations. Competitions for producing the fastest bay dogs are prevalent in the South, with Uncle Earl's Hog Dog Trials in Louisiana a popular example, held every summer since 1995. Preferred scent dogs for catching feral pigs mostly are native breeds, and include the Louisiana Catahoula Leopard Dog, the Blue Lacy, all members of the Coonhound type, the Plott Hound, and the Blackmouth Cur; catch dogs typically are American Pit Bull Terriers and their crosses, and American Bulldogs. The method of hunting has little variation and usually the hunter will send out bay dogs trained to chase the pig until it tires and then corner it, then a bigger catch dog is sent out to catch and hold down the pig, which may get aggressive, until the hunter arrives to kill it.[27][28] No single management technique alone can be totally effective at controlling feral pig populations. Harvesting 66% of the total population per year is required to keep the Texas feral pig populations stable.[29] Best management practices suggest the use of corral traps which have the ability to capture the entire sounder of feral pigs. The federal government spends $20 million on feral pig management.[30] In February 2017, Texas Agriculture Commissioner Sid Miller approved the use of a pesticide called Kaput Feral Hog Lure, which is bait food laced with warfarin (a rodenticide used to kill rodents).[31] It is estimated that 2.5 million feral hogs are in Texas and they cause about $50 million in agriculture damage per year.