As of 2011, Massachusetts law requires the addition of a bittering agent to retail containers of antifreeze to deter ingestion and poisonings of children and animals. However, many people get their cars serviced at garages, which use wholesale containers of antifreeze that are not treated with a bittering agent. Leaks of untreated antifreeze still result in poisonings. In MA legislation has been filed that would require that wholesale containers, such as those used at automotive service stations, also contain a bittering agent to prevent ingestion. Find out what your state requires and speak to your representatives about a national law.