My former lab has had 2 since 2012. I know of other labs at the school with more than that. I left, but not as the person I thought was going to leave when I started.
The advice on talking to students is absolutely correct. And to be very clear, if you do not find any good labs in the schools you were admitted to: Do Not Go To Grad School At All. Reapply to other schools and wait. A year waiting is worth the 4 on the backend being a drone in a bad lab.
The advice on talking to students is absolutely correct. And to be very clear, if you do not find any good labs in the schools you were admitted to: Do Not Go To Grad School At All. Reapply to other schools and wait. A year waiting is worth the 4 on the backend being a drone in a bad lab.