Serbian police officers of the Special Anti-Terrorist Unit pose for a picture in their base outside Belgrade October 8, 2014. When the killing of an unarmed black teenager by a white policeman in Ferguson, Missouri, in August sparked sometimes violent protests, the response of police in camouflage gear and armoured vehicles wielding stun grenades and assault rifles seemed more like a combat operation than a public order measure. Some U.S. police departments have recently acquired U.S. military-surplus hardware from wars abroad, but there are many law enforcers around the world whose rules of engagement also allow the use of lethal force with relatively few restrictions. But for every regulation that gives police wide scope to use firearms, there is another code that sharply limits their use. In Serbia, police may use measures ranging from batons to special vehicles, water cannon and tear gas on groups of people who have gathered illegally and are behaving in a way that is violent or could cause violence, but they may use firearms only when life is endangered. (Photo by Marko Djurica/Reuters)

UK Big Brother 2016 Winner Jason Burrill and Aisleyne Horgan Wallace pictured having a heated arguement in the middle of the street in Highgate, London afternoon September 11, 2016. Aisleyne was seen throwing a bottle of water in Jasons face. (Photo by KP Pictures)

Migrant children play with leaves during Christmas Eve at a shelter, as they travel with their parents as part of a caravan with humanitarian visas to transit throughout the country, in Monterrey, Mexico on December 24, 2021. (Photo by Daniel Becerril/Reuters)

A Civil Protection employee dressed as death participates in the campaign “Beware of Monoxide, the Silent Killer”, which seeks to prevent deaths from poisoning with carbon monoxide through the use of heaters to mitigate low temperatures, on an avenue in Ciudad Juarez, Mexico on February 2, 2022. (Photo by Jose Luis Gonzalez/Reuters)

A man walks with a Cyberdog, produced by Chinese tech company Xiaomi, on February 19, 2022 in Beijing, China.The quadruped robots, often owned by tech and robotic enthusiasts, do not have a specific purpose so far, but the open source nature of the robots could make them suitable for several applications in the future. (Photo by Andrea Verdelli/Getty Images)

A cyclist shops for a gift from a roadside open-air vendor during Valentine's Day celebrations amid the COVID-19 pandemic in Kamwokya, Kampala, Uganda on February 14, 2022. (Photo by Miriam Watsemba/Reuters)

Richard Winsor, Ashley Shaw, Zizi Strallen, Glenn Graham, Nicole Kabera, Harrison Dowzell, Will Bozier and Cordelia Braithwaite during a photo call for Sir Matthew Bourne's The Car Man at the Royal Albert Hall, London on May 11, 2022, a reinterpretation of Bizet's Carmen, staged in 1960s American diner-garages with a specially expanded 65-dancer production for the hall, as part of its 150th anniversary. (Photo by Ian West/PA Images via Getty Images)

Primary school students attend an emergency evacuation drill on China's national day for disaster prevention and relief on May 12, 2022 in Hefei, Anhui Province of China. China's national day for disaster prevention and relief falls on May 12 every year. (Photo by Ge Qingzhao/VCG via Getty Images)