Application of Pepper Ball in American PolicePepper ball guns were used by some police departments in the United States in the 1980s, especially in dealing with some protests and riots. This weapon is considered as a non-lethal weapon, which can fire pepper balls containing powdered tear agent, thus controlling and dispersing troublemakers.However, with the increasing use of pepper ball guns, controversy and criticism have also increased. Some people think that pepper gun has caused excessive stimulation to non-combatants, and even caused casualties. In addition, the use of this weapon has also been questioned and disputed by some legal and ethical issues.In some cases, the use of pepper ball guns even led to some lawsuits. Some people think that the use of pepper gun violates the Second Amendment of the US Constitution, that is, citizens have the right to keep and carry weapons. In addition, some places have begun to restrict or prohibit the use of pepper ball guns.Generally speaking, although the pepper ball gun is regarded as an effective non-lethal weapon by some police departments, it must be used with caution and abide by relevant laws and ethics. In addition, when using pepper ball guns, appropriate measures should be taken to protect civilians and non-combatants to avoid unnecessary pain and injury.