Might have been mentioned or in one of the vids, but wanted to throw out there the obvious that cured material infected by pathogens like hplvd, tmv etc... is something often overlooked, perfectly healthy looking assymptomatic plants and cures that are infected, buying or being gifted herb, or maybe think they can grow out a plant infected on its own somewhere quarantined from everything else because it's so special to you (just dont). that stuff gets put in the same grinder you touch daily, gets on your fingers, on your phone, keyboard, mouse. So I guess i'm getting at less direct factors of spread that are pretty serious, also putting emphasis on a regimen for sterilizing whatever items you tend to use when ingesting cannabis as well and the things you interact with when doing so (phones, controller, tea cup whatever). watch those casual stem rubs.
I did HEAR that not all seeds apparently will be infected by exposure, something like 20 percent or less will have it, and you can breed for asymptomatic type resistance within that 20 percent but it's not true resistance. but I want feedback so I prefer my plants let me know something bad is amiss, otherwise every new introduction to the garden becomes a long ass project of its own and your really just stuck with playing with those...or you can't really pinpoint what new introduction may have triggered others to be your "first" when really it was the second or third infected. I like being able to test new things out all the time and not worry. So much money in hplvd testing right now among the snake oils out there as mentioned, shady happenings in the business of proprietaries and gene mods... allot of people working with it in their gardens right now that have no clue
Wouldn't ever have all plants tested if suspected (that's a deep pocket) maybe just one that's been around longest so in a way has been a lure and most likely exposed, or of course anything with obvious symptoms or precious. Fresh wipe if pos, cognizant of all things in your library stock, possible seeds or packs touched during that period etc.. If there was something valuable enough, get a tissue culture of for a meristem cleanup. I treat the seed vault the same as a razor blade between cuts , just get a new/clean set of seed handling tools for each vial from different plants/breeders, gloved up. its ocd but I don't even grow out seeds from different vials together with others for a good while, nothing shares a drain pan until it's been vetted through a harvest but testing is really the only safe way it's just so pricey and can be snakey right now (i personally feel like)+ you have to ship things... If you are a breeder putting gear out there to people then definitely better be testing in/out the whole library, and having you're own means to test cheap without shipping anything is more ideal... qPCR kits I last checked are like 50 tests for 500 clams. A clone library of like 100 mommas would be about $800-1000 to qPCR..