What are the ranks of the police that are assigned to take fingerprints at police station?

Guys please I have a couple of questions 1. What are the ranks of the police that are assigned to take fingerprints and photos and all that stuff at a police station when a suspect is arrested. Are they simply just police officers or corporal or what? 2. when you are suspected of a serious crime like murder, you... show more Guys please I have a couple of questions

1. What are the ranks of the police that are assigned to take fingerprints and photos and all that stuff at a police station when a suspect is arrested. Are they simply just police officers or corporal or what?

2. when you are suspected of a serious crime like murder, you are taken to a police station. Lets say for example a DNA finger printing is carried out on one of your items for evidence before you can be cleared of all charges, how long do people generally wait in custody for the DNA analysis to get ready? An estimation please.
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