How do medical schools verify my hospital experience and shadowing experience unless i provide a written proof by doctors/hospitals? Do they trust us and expect us not to lie? Or maybe they ask specific questions in interviews to make sure all hospital experiences are true?? I know I am tempted to lie a bit but I don't feel safe....
Don't lie. And that's a bad question to ask on SDN because you may be dragged through shizit for it. Regardless, they (generally) do not verify, but it has happened that they have contacted supervisors and the such (there's stories of it somewhere on SDN). They WILL ask questions during your interviews, and they WILL notice if you can't speak fluently about what you've done, or said you've done. Third of all, if it's really significant stuff, they'll ask why there's no LOR from it, since many applicants get LORs from their research supervisors, doctors they've shadowed/worked with, etc. Honestly, I think it would be fairly easy to get away with lying, but I'd think you were a bad person, and if you're caught, that's no good. So, just don't do it. If you don't have enough to put on your amcas (and adcoms say you do NOT need to fill everything up), then get more involved.
Don't lie. It's unethical, lame, and you could get caught.
As to how they "verify" experience, when you fill out your AMCAS, you'll be asked to provide the name and group/institutional affiliation of a contact person who can confirm that what you say is true. They are perfectly entitled to contact this person if something you say sound fishy or if they just want to do random checks.
As for specific questions about your experiences, yes, you will certainly be asked to describe what you saw and did at the hospital. So if you say something that couldn't be true or that doesn't make sense, then you'll likely be in for it...