When packaging wet materials, what should be used?

Using plastic when packaging wet materials is the most suitable choice because plastic is waterproof and can effectively contain moisture without compromising the integrity of the evidence. This helps prevent degradation and contamination of the materials, ensuring they remain viable for analysis and processing.

Cardboard, while sturdy, is not appropriate for wet materials as it can absorb moisture, leading to deterioration and potential loss of important evidence. Paper would also absorb moisture, which could result in the evidence being damaged or degraded over time. Wood, similar to cardboard, is porous and can absorb moisture, making it an unsuitable option for packaging items that are wet.

Choosing plastic not only preserves the condition of the wet materials but also provides a secure and reliable way to transport and store evidence, which is crucial in maintaining the chain of custody in criminal investigations.