In what condition should liquid blood evidence be stored to ensure stability?

The stability of liquid blood evidence is best maintained when it is stored at room temperature in a paper bag. Storing blood in a paper bag allows for proper moisture control and helps prevent the growth of bacteria that can occur if the sample is sealed in an airtight container. This method also helps in preventing contamination and allows the blood sample to be easily accessible for later testing and analysis.

While freezing or refrigeration might seem like good options for preservation, they can lead to changes in the blood sample that could compromise its integrity. For instance, freezing can cause the blood cells to lyse or break apart, which may affect the results of any subsequent analysis. Refrigeration can similarly alter the biochemical properties of the sample over time unless it is properly prepared and treated. Chemically treating a sample immediately might change its composition and also could lead to degradation if not done correctly.

Thus, storing liquid blood evidence at room temperature in a breathable medium such as a paper bag is the most effective method for maintaining its stability and integrity for forensic analysis.