Ensuring that evidence is collected in an accurate and timely manner helps officers to better understand what happened at the scene and aids in the investigation being completed successfully. Only the appropriate personnel with the proper knowledge and training should be collecting evidence. These individuals include First Responders, Crime Scene Investigators, and other specialized personnel. Different types of evidence will sometimes need different methods of collection or specific containers. For instance, paper containers, such as bags, envelopes, or boxes, may be optimal for biological samples. Paper containers allow evidence that is not completely dry to continue drying. This type of collection protects those samples from deteriorating. When the evidence is collected properly there is less of a chance that the items collected will be damaged or contaminated.