a. A person commits an offense if he purposely obstructs, impairs or perverts the administration of law or other governmental function or prevents or attempts to prevent a public servant from lawfully performing an official function by means of flight, intimidation, force, violence, or physical interference or obstacle, or by means of any independently unlawful act. This section does not apply to failure to perform a legal duty other than an official duty, or any other means of avoiding compliance with law without affirmative interference with governmental functions.
b. An offense under this section is a crime of the fourth degree if the actor obstructs the detection or investigation of a crime or the prosecution of a person for a crime, otherwise it is a disorderly persons offense.
L.1978, c.95; amended 1986, c.34, 2000, c.18, s.1.