CSI: Crime Scene Investigation: Dark Motives Requests

please help me im stuck i have picked up the envelope of cash from bick shop and have linked most of my evidence but still cant get a warrent for cory on level one please please help me.

iam stuck i have found all the clues but am not moving forward in the game no one will talk to me.

I have three fingerprints I am trying to get the coffee cup finger print but i am not able to match it. So how do i get the fingerprint

Help me with case 4: I have all clues basically- I just need the owner of the shoes print (the smudged one) and I have 2 parts of a fingerprint I need another before I can match it. I need some suggestions please!!!!!!!1

Please make a walkthrough! This game is fun but ,gosh, its hard!