Medical scientists usually need a doctorate degree in biological science. Some medical scientists have medical degrees. Medical scientists typically complete courses in biology, chemistry, physics, engineering, mathematics, and computer science.
Status: Medical Student (Accepted) AMCAS states that it usually takes ~4-6 weeks for verification to go through, but looking at the verification trend right now here: http://forums.studentdoctor.net/threads/2014-2015-verification-thread.1076112/ I would say you're looking at 3-4 weeks from the time of submission.
Letters sent electronically through the AMCAS Letter Writer Application, Interfolio or VirtualEvals are matched to a student's application within one business day. Letters sent through the mail can take up to 15 days from the date of receipt to be matched to the appropriate application. If you wish to submit a letter by mail, please send it to: AMCAS, Attn: AMCAS Letters. AAMC Medical School Application Services.