For purposes of the law in Chicago, vehicular hijacking covers a range of vehicles, including boats. The key issues that arise when facing such a charge can be understood by looking at the example of a rather hapless Chicago teen who stole an SUV belonging to the FBI. There were several criminal matters arising out of that act that would all be considered during the trial.
First of all, the teenager was on probation and already had an extensive criminal record. The probation violations were dealt with as a separate issue but also one that could aggravate the crime despite the fact that the perpetrator was a minor. His lawyers inevitably wanted to minimize evidence of his past crimes as much as allowable under the current law.
Compounding and Relevant Factors