What can be placed over footprints to prevent degradation before documentation?

Using cardboard over footprints is an effective method to prevent degradation prior to documentation. Cardboard is sturdy and provides a protective barrier that helps to shield the footprint from environmental factors such as wind, rain, and foot traffic. It can rest securely over the footprint without altering or disturbing it, ensuring that the details remain intact for accurate documentation.

In contrast, while paper might seem like a viable option, it is typically too thin to offer adequate protection against elements that could cause smudging or distortion. Plastic wrap can trap moisture and humidity, potentially leading to mold growth or affecting the condition of the footprint. Tape can adhere directly to the footprint surface and may cause damage upon removal, compromising the footprint's integrity. Therefore, cardboard stands out as the most suitable material for safeguarding evidence in this context.