1. i think the toughest part about securing a crime scene or collecting evidence would have to be the people. anytime there is a crime scene going on friends, neighbors, just people who want to see what happened come to watch. the tough part about this is that you have to keep the people back. if they get in they could easily compromise evidence or just destroy it generally.
2. i think the most interesting aspect of working at a crime scene would have to be searching for and collecting the evidence. i think this because it would be interesting to walk around and record things and collect anything that could have been used in the case. you then could bring it into the lab and investgate futher and put the pieces together and figure ut what happened.