Lmao. You brought back memories as I used to grow the hell out of shrooms.
Fuck trichoderma and cobweb mold btw.
To your point though, and what others can't seem to comprehend is that even after autoclave sterilizing spawn, using a clean culture, prepping with alcohol, and flame sterilizing a needle while using aseptic techniques you STILL can get comtaminates and that's just while growing.
Without the use of BA I can't even imagine the microorganisms one could be potentially injecting into themselves when having multi use vials in the fridge for weeks.