What is the first action to take when handling biological fluids and stains?

Wearing disposable gloves is the appropriate first action when handling biological fluids and stains because it ensures personal protection from potentially infectious materials. This practice is critical in maintaining both the safety of the individual handling the fluids and the integrity of the evidence. Disposable gloves act as a barrier, preventing contamination from the handler and reducing the risk of transmittable diseases from biological substances, which may contain pathogens such as HIV, hepatitis, or other infectious organisms.

Following the proper protocol of putting on gloves before any interaction with biological evidence helps to preserve the evidence's authenticity and minimizes cross-contamination. It’s vital for maintaining forensic integrity, which is crucial for any subsequent investigation and legal proceedings. This initial protective step is fundamental in lawful procedures and adheres to health and safety standards necessary in law enforcement practices.