If i am going to be honest with you, in my own humble opinion without being sentimental of course, without offending anyone who thinks differently from my own point of view, but also by looking into this matter in distinctive perspective, i would like to say i have nothing to say.
No you got to witness all evidence (3 for standard, 2 for nightmare)
Even though we verify runs for this game, we still enjoy running it. Most of us has dedicated 1000+ hours into speedrunning, practicing and learning new strategies for this game. We can easily point out when there is mods or external softwares being used and I can assure you that if any verifier somehow WAS using a mod to control the ghost it would of been caught a longgg time ago. I know it seems like we just get the record and the perfect RNG but if you'd like I can send you folders filled with 200gb+ of attempted runs for this game. Just like how Vision said if you believe someone cheated in a run and we somehow didn't catch it we are always available and you can DM any of us with these concerns. We will never be insulted if you think one of our own runs have been cheated. (This wasn't meant to sound rude or anything, so I apologize if it came off that way.)
If you join the discord, there is a guide to getting started and submitting runs in the #startup-guide channel.
Usually it can take from 1-4 days atm. When they're really behind it can take average about a week. If you're asking how to become a verifier then application or currently closed and you can't. If you're asking how to submit a run join the discord and follow the guide in the #startup-guide channel.