Which packaging method is recommended for fibers and textiles in crime scene processing?

The recommended packaging method for fibers and textiles in crime scene processing is the druggist fold or coin envelope. This method is employed primarily because it allows for proper preservation and minimizes the risk of contamination or degradation of the evidence. The druggist fold is a secure and compact way to package small pieces of textiles or fibers while preventing them from being crushed or damaged.

Fibers and textiles can be easily transferred between surfaces and are particularly susceptible to loss. The coin envelope provides a controlled environment that protects the evidence from external factors such as moisture, light, and additional debris. This method also makes it easier for investigators to label the evidence and maintain the chain of custody.

The other packaging methods mentioned may not provide the necessary protection and security for such evidence. For example, plastic bags can create a moist environment, which may harm the integrity of fibers. Cardboard boxes, while good for some evidence, might not prevent movement or damage if the fibers shift during transport. Sealed jars are generally too rigid for textiles and can also risk crushing or damaging fragile fibers during handling.