What should be used to collect broken glass at a crime scene?

Using a brush and dustpan to collect broken glass at a crime scene is the most effective method because it ensures a careful and thorough collection process while minimizing the risk of injury and preserving potential evidence. The brush allows for the delicate picking up of tiny shards that may be missed if using more hands-on approaches, while the dustpan collects the glass efficiently without disturbing the surrounding area.

Hands are not appropriate for this task due to the danger of cuts and the difficulty in gathering small fragments effectively. A vacuum cleaner, while it could remove the glass, poses the risk of damaging or destroying trace evidence that may be on the glass or in the vicinity. Additionally, a vacuum may not capture all pieces effectively, especially when dealing with fine glass fragments. A paper towel might work in some situations but it is not suitable for gathering broken glass, as it can break, tear, or fail to pick up smaller pieces effectively, leading to potential safety hazards and loss of evidence. Thus, a brush and dustpan provide a safe and thorough method for collecting glass at a crime scene.