The show is about fighting/stopping crime, but the characters don't like following regulations: The Hawaii Five-0 unit was formed to take out the worst criminal elements, apparently without regard for due process or constitutional rights. Search warrants are unnecessary, and when in doubt, the characters shoot first and ask questions later (that is, if the suspects survive).
Well-trained commandos frequently take on equally well-trained terrorists and criminal gangs using automatic weapons, attack helicopters, and some intense martial arts moves. Lots of gun battles, and people are shot and some die (albeit generally quickly and fairly bloodlessly). There is also sexually tinged violence: A woman in a tight, short Halloween costume is chained to a workbench begging a killer to let her go; he ignores her pleas and begins doing something terrible to her face that splatters him with blood. There are dead bodies shown, bloody and mauled.
Plenty of women in bikinis. An undercover officer must take off her dress, ostensibly to prove she isn't carrying a wire, but the bad guys take the opportunity to leer at her in her underwear. Unmarried adults talk about sex and seduction, and kiss before the camera cuts away and implied sex takes place offscreen. The camera sometimes pans slowly up the bodies of female victims as they beg for mercy or scream in terror.
Words include "fricking" and "son of a bitch."
The characters often use iPhones and iPads, and the show promotes the U.S. Navy enthusiastically, with characters often making statements like serving in the Navy was a father's "duty to his country."
Drinking, Drugs & Smoking
Characters often relax with beers at the end of the day, though they are careful to avoid alcohol when on duty.