RUDN Journal of LawRUDN Journal of Law2313-23372408-9001Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)6006Research ArticleStrict liability ultra-hazardous activity in the doctrine and law-enforcement practice of the USARumyantsevM BThe Department of Civil and Labour Lawmikrumjancev@rambler.ruPeoples’ Friendship University of Russia15032013319120307092016Copyright © 2016, Legal Science2016The article embraces the approaches of the USA jurisprudence and law enforcement practice towards the concept of ultra hazardous / abnormally dangerous activity. The criteria, allowing to differentiate situations in which the tortfeasure is liable to a strict liability, or to responsibility for negligence are being touched upon.USAtortstrict (absolute) liabilityultra hazardous / abnormally dangerous activitynegligencereasonable care and utmost careСШАделиктстрогая ответственностьповышено опасная деятельностьответственность за небрежностьразумная забота и наивысшая забота