You don't expose yourself to dangerous situations. There are roads that you just don't travel because of bandits. You would be just asking to be robbed. You don't even go there. The living conditions for the Haitian missionaries are meager, which makes hearing testing somewhat difficult.
Electrical power is intermittent.
The water supply is neither safe to drink nor abundant. Battery-powered audiometers are not sufficient to test for the full range of hearing deficiencies. We've never taken a day off to scuba-dive and sit on the beach like some people do when they go on mission trips. We work, work, work, all day long, every day. In 1998, Brister planned and implemented the first Haitian educational conference for educators of the deaf.