What actions should a UPL take if they suspect a soldier is abusing substances?

The appropriate action for a Unit Prevention Leader (UPL) to take if they suspect a soldier is abusing substances is to document observations and consult with the commander. This approach is correct because it enables the UPL to maintain a professional and systematic response to potential substance abuse concerns.

Documenting observations provides an accurate account of any concerning behavior, which is crucial for any subsequent evaluation or action. By consulting with the commander, the UPL ensures that the issue is addressed through the appropriate chain of command, allowing for proper investigation and support for the soldier in question. This response adheres to military policy and emphasizes a concern for the soldier's welfare while also recognizing the need to uphold army standards.

Taking any other approach, such as ignoring the behavior or confronting the soldier directly without following procedure, can lead to a lack of accountability and may not provide the soldier with the help they need. Referring the soldier to another unit without proper documentation and consultation can also undermine the unit’s responsibility and complicate the evaluation process. Thus, the proper protocol outlined in the correct choice ensures both the soldier's welfare and the integrity of the unit.