Is there any source on this? I see people say this every time this thread comes up, but unless its a situation where it is somehow discovered after the fact and you get kicked out(which has happened according to people on this board) I doubt it. I think what would happen is that school would reject you instantly and then forget you even existed while they attend to the thousands of other apps. The process of even proving somebody lied about things like ECs which have a subjective component to blackball them, seems like an enormous waste of time for most schools.
1)Most importantly, integrity.
What about if people conceal transcripts? I was pretty anal about submitting all my transcripts, even the CC during the summer, but I could imagine applicants not following through there, especially if they got F's and would like the experience forgotten... How do adcoms find out about old transcripts?
Yes, people get kicked out. And yes, there are certain types of lies that are far more egregious than others, that are much easier to verify than others, and that have variable degrees of punishment.
True stories: my in-state medical school required 2 semesters Biochem for entrance - probably not as unique now, but 10 years ago, it was one of the very few. Guy I went to undergrad with started taking the sequence as a senior, had obviously applied in the fall so that first semester course showed up on his initial transcript and he filled out his AMCAS saying he planned to take the second course. He completed the first semester, started the second semester course, and got his acceptance before the deadline for withdrawals from class. Since he was accepted, he just withdrew, didn't have to take the W since it was so early and then coasted through his 2nd semester. Fast forward to the third week of med school, suddenly, he's no longer around. Turns out they finally got around to verifying final transcripts and realized he didn't complete the admission requirements and he was gone. I ran into him at the bars one night a couple weeks later and he told me that he asked them if he could just take the course and regain his acceptance, and they flat out told him "absolutely not" because his lack of integrity was apparent and they didn't feel his character was consistent with the ideals they felt were important for physicians.
Second story, but different set of circumstances and results: My med school did a background check, and so when you signed your enrollment agreement, you obviously had to disclose any thing you thought might show up. In between that disclosure and the background check being run, my friend got a ticket for public urination. Background check gets run, ticket shows up, my friend gets called into the office of the Dean of Students for not disclosing. Obviously he couldn't have disclosed it, explains it was a mistake, they have a good laugh and the Dean of Students ends up talking to him for an hour about his own hijinks in college and med school.
But in the end it comes down to integrity - for the rest of your career you're going to have to disclose a lot of information, some of it that is not going to be positive on your part. Every time you apply for a medical license, any job, privileges at a hospital or for acceptance into a insurance payment program (which you need to actually get paid) you're going to have to disclose any disciplinary actions, law suits, or mental health/substance abuse issues. If you lie on those, you don't get a license, don't get a job, don't get hospital privileges, or don't get paid for your work. There is a need for honesty and integrity from the very beginning.