Bath salts, a synthetic stimulant that mimics cocaine and methamphetamine, spread through American communities largely because it could be sold legally in gas stations and head shops and rarely showed up on standard drug tests. Journalist Nick Lazaredes travels across the United States tracking the drug's toll, sitting with families who describe watching a son or daughter's personality disappear, replaced by paranoia, violence, or psychosis they no longer recognize. Law enforcement officers explain the trap they are caught in: each time a state outlaws one chemical formula, manufacturers tweak the molecule slightly and put a legal version back on shelves within weeks. The film moves between living rooms and police interviews rather than staged reenactments, letting parents and officers carry the story in their own words. It avoids the shock-footage approach common to drug documentaries, sticking instead to specific accounts of arrests, hospitalizations, and legislative attempts that keep failing to keep pace with the chemistry. The picture that emerges is less about one drug than about a regulatory system built too slowly for a problem that mutates on purpose.