In comparison, the Professional Rodeo Cowboys Association (PRCA) reports an animal injury rate of less than one percent in its sanctioned US rodeos. However, The Charro Association notes that the PRCA only sanctions about 30 percent of all US rodeos, Unsanctioned rodeos may have higher abuse and injury rates, and the ASPCA notes that rodeo practice sessions are often the location of more severe abuses than competitions. Likewise, anecdotal reports suggest the worst charreada abuses in the USA occur at events held in small venues with little public notice, and the deepest concerns are directed these unsanctioned events. The problem appears to be most often reported in California, where horse-tripping is banned, yet private "backyard" events still feature these events.