Abby gives Carter an envelope in the break room. He opens it, picks up his coffee, leaves the break room and the envelops disappears. Then it materializes in his coat pocket.
When they are treating the cop and the other gun shot victim (Leon's friend), Dr. Corday goes between the two victims without changing her gown or gloves. Even if there is no blood (or anything else) visible, gowns and gloves are always changed between patients so there is not contamination.