PHOENIX — Maricopa County health officials issued a warning Friday about a possible measles exposure in the East Valley. According to the Maricopa County Department of Public Health (MCDPH), the exposure, which involved someone who does not live in Maricopa County, happened at the Hale Centre Theatre Arizona on the following dates and times: Jan. 5, 6 and 7 from 6:30 p.m. to 11:30 p.m. Jan.