§ 185.212 § 185.212 Mandatory chemical testing following serious marine incidents. A marine employer whose vessel is involved in a casualty or incident that is, or is likely to become, a serious marine incident as defined in § 4.03-2 of subchapter A of this chapter shall comply with the requirements of § 4.06 in subchapter A of this chapter.
46 CFR §185.212
46 CFR Part 185
TL;DR
§ 185.212 § 185.212 Mandatory chemical testing following serious marine incidents.