Nevada Arrest Laws

NV Rev Stat § 171.137 (2020) 
  1. Except as otherwise provided in subsection 2, whether or not a warrant has been issued, a peace officer shall, unless mitigating circumstances exist, arrest a person when the peace officer has probable cause to believe that the person to be arrested has, within the preceding 24 hours, committed a battery upon his or her spouse, former spouse, any other person to whom he or she is related by blood or marriage, a person with whom he or she has had or is having a dating relationship, a person with whom he or she has a child in common, the minor child of any of those persons, his or her minor child or a person who is the custodian or guardian of his or her minor child.