They use a sort of greasy foam to insulate from infection. It's not foolproof, so the ones who go that route get paid extra. Jameson only works with people she trusts and people who are constantly tested. The number of people on that list is actually relatively small, and it's usually a sign of dangerous extra-curricular activities, after around 1985.
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"The idea that money doesn't buy you happiness is a lie put about by the rich, to stop the poor from killing them." -- Michael Caine
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