During a sexual offense investigation, what aspect does NOT help establish the perpetrator's modus operandi (M.O.)?

The aspect that does not help establish the perpetrator's modus operandi (M.O.) is the vehicle's purchase history. The M.O. refers to the patterns and methods a perpetrator uses when committing a crime, which typically involve their choices and actions during the offense itself.

The weapon used, the time the offense occurred, and the location and comments made to the victim all provide contextual clues about how the offender operates. These elements can indicate specific behavioral patterns or preferences that can be crucial for understanding and predicting future offenses. On the other hand, the vehicle's purchase history does not provide direct insight into the characteristics or behaviors of the offender during the commission of a sexual offense, making it less relevant in establishing the M.O.