Section 112.81 - How do the requirements of this subpart apply to areas where covered activities take place?(a) The requirements of this subpart apply when a covered activity takes place in an outdoor area or a partially-enclosed building and when, under the circumstances, there is a reasonable probability that animals will contaminate covered produce.(b) The requirements of this subpart do not apply:(1) When a covered activity takes place in a fully-enclosed building; or(2) To fish used in aquaculture operations.