So in my note, do I just need to make it clear I killed myself and why, or do I also need to specify what I used? The clonazapam is from a prescription I had a few years ago (do I just leave the bottle in plain sight?) and the domperidone was bought from India (although I have gastropareses, and domperidone is used to treat it in countries outside the US). And then there is the SN. I'll peal the label off and hide it somewhere to protect the brand name, but do I mention the SN in my note to speed things along investigation wise, and maybe get to skip an autopsy (obviously I don't care if I'm autopsied, but it might be hard on my parents). I figure being blue might make it unnecessary to mention the SN. As for the leftover SN, I'll just put the unlabeled bottle of powder in a cabinet and it will probably get tossed out without a second thought once my stuff is gone through. Hopefully LE won't care enough to look into where I bought it.
The best answer is "it depends..."
Leaving a note and how you CTB will help, but it might not necessarily prevent an autopsy or investigation.
My boyfriend CTB by use of firearm..but almost two months later still don't have his death certificate because the coroner is waiting toxicology report before issuing the cause of death (although it was very obvious).
Police have to do due diligent, that can range from an interview with family/friends, gathering of suicide notes and of course investigating the area of death. My BF died in a field off of a dirt road, but they still went through his car, still took the notes he left for me and his family (and they did not give me back the originals which is heartbreaking to me) and recorded the last messages we sent each other as well as my call log even though he died an hour away from me, I had called the police when he texted me that he was going to end it and I was driving as fast as I could to try and stop him.
As for an autopsy, I cannot say if that is guaranteed or not. I don't even know if they autopsied my boyfriend...I did not see him before he was cremated and it did take a week for his cremation which seemed long to me, to be honest I didn't ask.. though I have been told by an acquaintance whose BF died by firearm had been autopsied...
All I can say is there WILL be some form of an investigation. The police did not come to our house and go through my or his things, but they did not just accept the notes and the scene as a an open and shut they will ask
some questions.
I will say that the acquaintance whose BF died in their home said their house was thoroughly went through by the police, items taken, place left in a disarray so keep that in mind.
For those who are extremely private individuals do know that your next of kin will have the ability to go through your things (can be limited by your will but will have to be enforced by your executor of your will) after you are gone, so prepare accordingly.