Damn, really? I'm a registered organ donor so it'd suck if they just ignored that because I ctb
Look at the way organ donation typically works: an accident with known circumstances puts someone on life support. The docs can run a tox screen and be confident that there is no criminal action at play. With a suicide, there are too many question marks for the legal system --even if you leave a note-- and the coroner will inevitably hold the body until the inquest/investigation closes the file that yes, it was suicide. By which time, your organs are long past their sell-by date.
The only way I can see it working is if you try, are unsuccessful, and end up on life support for long enough that all the questions are answered: no harmful drugs in your system, no foul play. Your family pulls the plug and your organs are donated.
I don't know about elsewhere, but here in WA there are no metal detectors in hospitals: I have my CPL (CCW) and used to carry a gun day to day, and was never stopped on those times when I went into the hospital.
Mental facility, yes, there are laws about that, but not a regular hospital.