Obstruction of justice is a Class 1 misdemeanor. The most commonly charged version of Obstruction of justice requires the prosecutor to prove
1. that someone knowingly attempted to impede a law enforcement officer
2. By threats or force
3. In the lawful performance of his duties.
A criminal defense attorney will be able to advise you about your case. An attorney can tell you whether you should fight the charge or try to work out an agreement with the prosecutor. Often, obstruction of justice charges come along with other charges which means that a plea agreement can be negotiated that causes the one of the charges to be dismissed.