About a week after Iowa's ag-gag law was struck down over free speech violations, a national animal rights group is advertising for an investigator to work undercover in Iowa livestock and meat processing facilities. Mercy For Animals, a Los Angeles animal welfare group, is advertising online for an Iowa-based undercover investigator to work at "factory farms, hatcheries, livestock markets and slaughterhouses" to catch possible animal abuse.The California group said it routinely advertises for undercover investigators, and didn't target Iowa because of the federal court ruling last week.