The Swat team that burst into the Phonesavanh’s room looking for a drug dealer had deployed a tactic commonly used by the US military in warzones, and increasingly by domestic police forces across the US. They threw an explosive device called a flashbang that is designed to distract and temporarily blind suspects to allow officers to overpower and detain them. The device had landed in Bou Bou’s cot and detonated in the baby’s face.