In February 2012, Connecticut Senate Bill 452 (SB452) was put forward to remedy the fact that Connecticut was one of less than ten states in the U.S. to lack an "assisted outpatient treatment" (AOT) law. As David Stein has pointed out, there are just six states that lack such a law.
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Had this law passed, it may have forced Adam Lanza to be treated for his alleged mental illness instead of allowing him to roam free, and ultimately to kill 26 persons and himself in a vindictive rage on Friday.
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Why didn't the legislation pass? Because the ACLU and other "civil liberties" groups and individuals cried foul. The ACLU in particular said 452 would "infringe on patients' privacy rights by expanding [the circle of] who can medicate individuals without their consent." They also said it infringed on patient rights by reducing the number of doctors' opinions necessary to commit someone to institutionalization.