I haven't followed the specifics over last decade or whatever but shambles makes an excellent point. K is always the best medical option in those scenarios as it simply will not depress your breathing like Morphine can /will.
I sort of found this out backwards. Forgive for bad taste but I was smashed out me head on alcohol walking back from a club when I was about 20. I made the pissed up decision to end all and for good and snorted about half a gram of boom brighten K thinking this was good bye cruel world. To my confusion and mild embarrassment I came around several hours later naked and in a pile of my own vomit, though very much still alive. I felt cheated. There had been all these rumours about people OD'ing on K so I felt I had every right to rely on said substance to make transition from this world onto next. However, was not to be a later on, having done my research, can barely justify that as a valid suicide attempt. My heart was in the right place but it was the prevailing wisdom doing the rounds at the time that ultimately let me down.