In the collection of blood evidence, who controls the amount of force used?

The supervisor present controls the amount of force used in the collection of blood evidence because they are responsible for overseeing the procedure and ensuring that it is conducted safely and legally. Supervisors typically have the training and authority to make decisions regarding the appropriate level of force to be applied, which is critical in ensuring the integrity of the evidence collected and the safety of all individuals involved.

Medical personnel may also have an important role in the blood collection process, but their focus is primarily on the medical aspects rather than the application of force. The arresting officer may be involved in the collection but typically works under the guidance of the supervisor. The suspect’s attorney is not involved in the process of evidence collection and would not have authority over how it is conducted. Therefore, the supervisor's role is crucial in managing the situation effectively while adhering to proper procedures and protocols.