Liability/ Torts
There is no public policy bar to enforcement of a waiver of liability, given the generally permissive view of the legislature and the fact that the relevant misdemeanor negligence statute is silent as to the civil implications of negligence per se.
Strong drafting of release overwhelms considerations of the general characterization of risk
Dissent: Characterization of risk presents a genuine issue of material fact.
https://www.ca10.uscourts.gov/opinions/14/14-1444.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.