Banning DEAs might not be as effective at deterring undesirable users. They deliver painful stings, which are effective in both killing prey and deterring predators. The study concluded that the three-strikes policy was deterring recidivists from committing crimes. In response, the Keating Government instituted a mandatory detention policy aimed at deterring refugees. The eggs contain toxins from sea sponges as a means of deterring predators. Area denial weapons work by either incapacitating or deterring the enemy. However, has been assessed as ultimately ineffective in deterring police brutality. These findings suggest that antlers have a secondary function in deterring predation. Meng Tian achieved success in deterring the Xiongnu from advancing beyond the border. They spread the musk with their tails in hopes of deterring the threat. The Iberian ribbed newt ("Pleurodeles waltl") has another method of deterring aggressors. This proved to be unsuccessful in deterring crime, especially cattle rustling. Virtual Console is part of Nintendo's strategy for deterring video game piracy. Cameras have also been installed on public transport in the hope of deterring crime. The Locals blamed Donald Trump's tax changes for deterring wealthy buyers in 2019.