Write a study on the various techniques used to gather gunshot residue.

Write a study on the various techniques used to gather gunshot residue.https://nij.ojp.gov/nij-hosted-online-training-courses/firearms-examiner-training/home https://ejfs.springeropen.com/articles/10.1186/s41935-021-00223-9 USE ABOVE AS 2 OF THE 3 REFRENCES. I know I want to talk about the parafin collection method, the vaccuum lifT method, and the tape lifT method. The 4th method is 100% up to you.