Some Michiganders are jumping to the front of the line for coronavirus vaccines — putting themselves ahead of the state's most vulnerable. "People are scamming the system," said Dr. Arnold Monto, a professor of epidemiology and global public health at the University of Michigan. Monto, an octogenarian who lives in Ann Arbor and serves as acting chair of the U.S. Food and Drug Administration's Vaccines and Related Biological Products Advisory Committee, said he hasn't yet been vaccinated. With the demand so high and the supply of vaccines so low, Monto said he's holding out to make sure his wife, who also qualifies for vaccination because of her age, will be able to snag an appointment for a shot in the arm. So far, they've had no luck.