50 CFR 217.173 - Prohibitions.
Notwithstanding takings contemplated in § 217.170 and authorized by a Letter of Authorization issued under §§ 216.106 and 217.177 of this chapter, no person in connection with the activities described in § 217.170 may:
(a) Take any marine mammal not specified in § 217.172(b);
(b) Take any marine mammal specified in § 217.172(b) other than by incidental, unintentional Level B Harassment;
(c) Take a marine mammal specified in § 217.172(b) if such taking results in more than a negligible impact on the species or stocks of such marine mammal; or