If we are talking about deadly and venomous snakes, yes there are no such species in Hawaii that you might chance upon while hiking or doing outdoor activities. Such dangerous species are safely contained in zoos and are only displayed as live specimens.
There is also the harmless snake species, the Brahminy Blind Snakes (Ramphotyphlops braminus) which are minute and non-venomous. Since they do not pose any major threat, they are mostly left to their own devices. See how small this species is on the video below.
You see, snakes have no natural predators in Hawaii and could be a serious hazard to the state's environment and people if their population is not controlled. Many snake species prey on birds and their eggs, increasing the threat to endangered native birds. Bigger venomous species, on the other hand, can be a danger to humans and small pets.
This is the reason why the Hawaiian Department of Agriculture makes sure that snakes are not allowed to arrive and live on the islands. If you spot a snake in Hawaii, call 911 or 586-PEST (7378) immediately. if you happen to successfully brought one in without the knowledge of authorities, it may be surrendered without consequence under the state's amnesty program.