(a)   No person, without privilege to do so and with purpose to prevent, obstruct or delay the performance by a public official of any authorized act within the public official’s official capacity, shall do any act that hampers or impedes a public official in the performance of the public official’s lawful duties.  
   (b)   Whoever violates this section is guilty of obstructing official business. Except as otherwise provided in this subsection (b), obstructing official business is a misdemeanor of the second degree. If a violation of this section creates a risk of physical harm to any person, obstructing official business is a felony and shall be prosecuted under appropriate State law.
(ORC 2921.31)