As of March 2013, drug overdose “Good Samaritan” laws were in effect in 10 states and the District of Columbia, and were being actively considered by at least a half-dozen state legislatures. But many people are unaware of these laws, or are still fearful of being arrested if they call for help for overdose victims, anecdotal evidence shows. For example, this article out of Chicago reports that in one county, 175 people have died of heroin overdoses since 2007. In many of those cases, the article says, the victims were surrounded by people when they overdosed, but no one called 911 for help – even though Illinois passed a Good Samaritan law last year.
Good Samaritan laws typically provide immunity from drug possession charges; immunity applies to a person who seeks medical aid during an overdose (for example, by calling 911 or taking someone to the ER), and to a person having an overdose.