What is the hardest analysis you have had to do and did they catch him/her?

Question: What is the hardest analysis you have had to do and did they catch him/her?
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Asked by Phoenix to Baljit on 7 Nov 2015. This question was also asked by Paige.
- Baljit Ghatora answered on 7 Nov 2015:
  
  With analysis of evidence from s crime scene there is a lot of work involved in the actual experimentation side…the analysis needs to be performed using certain standards. The case is never solved just on one piece of evidence- but what makes it exciting is that the analysis you carry out you may need to go to court to present it in front of the jury. They will then decide the verdict of guilty or not guilty based upon the whole case.

Question: What is the hardest analysis you have had to do and did they catch him/her?