What type of container is recommended for storing evidence of flammable liquids?

Using glass or metal containers for storing evidence of flammable liquids is the recommended practice due to their non-reactive properties and ability to securely contain the substance. Glass and metal containers are less likely to react chemically with the liquids they hold, thus preventing any potential degradation or contamination of the evidence. Moreover, these materials are sturdy enough to withstand pressure and are less likely to leak, which is crucial when handling hazardous materials like flammable liquids.

In forensic contexts, ensuring the integrity and safety of evidence is paramount. Glass containers can provide an airtight seal, while metal containers can also be designed to prevent leakage and deterioration. This choice helps maintain the chain of custody and ensures that the evidence remains viable for analysis or court presentation.

The other container types, while useful for various materials, do not provide the same level of safety and integrity for flammable liquids. For instance, plastic containers may leach chemicals over time or may not be suitable for all types of flammable materials. Cardboard boxes and wooden crates are porous, which means they could allow flammable vapors to escape and may fail to provide an adequate barrier, thus compromising the evidence.