The "Safe" Injection Movement is sponsored by the Drug Policy Alliance, an advocacy group that works to decriminalize drugs and is funded largely by billionaire George Soros. The group has pushed, thus far unsuccessfully, for similar legislation in New York, Maryland, Massachusetts and Vermont.

Here's some examples of their thinking:  
http://www.nadcp.org/sites/default/files/2014/NADCP%20Initial%20Response%20to%20DPA%20and%20JPI%20Reports.pdf

http://www.nadcp.org/sites/default/files/nadcp/NADCP%20Response%20to%20DPA%20and%20JPI%20Media%20Attacks%20on%20Drug%20Courts.pdf