The legality of using tear gas by police at raves or similar gatherings to disperse crowds can vary based on jurisdiction, local laws, and the specific circumstances surrounding the event. In general, the use of tear gas is typically considered a form of crowd control that law enforcement is allowed to use under certain conditions, especially if they believe there is a threat to public safety or if the situation escalates into violence.
However, the deployment of tear gas is often viewed as a controversial measure due to its potential to cause harm and panic among civilians. Issues such as the presence of vulnerable individuals (like those with respiratory issues) and the location of the event (for instance, indoors versus outdoors) can influence the appropriateness and legality of such actions.
In many places, law enforcement agencies are required to follow specific protocols and use de-escalation techniques before resorting to tear gas or other crowd control measures. It’s also worth noting that there may be public outcry and legal challenges if the use of tear gas is deemed excessive or unnecessary.
For specific legal advice or the most accurate information, it's crucial to consult local laws or a legal expert.