21 CFR § 112.81
How do the requirements of this subpart apply to areas where covered activities take place?
June 25, 2020
(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.