The FBI furnishes an annual book of crime statistics, called the UCR report with these answers. In genral the south has the biggest crime rates, and the midwest and west the lowest, with the exception of large cities. However, I think that one of the biggest problems for society today is the birth of children to drug addicts, who may already be addicts, and whose mothers did not receive adequate care, thereby causing a high rate of bith defects among such drug addicts. In response to the evolving internet technology, many police departments are forming new units to go after internet crime. In this case I think we are talking mainly about pedophiles tring to link up with children.
Some police pose as children on the internet, trying to trap such people.
One problem is that if a pedophile is in a different city than where the police are, it is hard to arrest them. Concerning fraud, the internet is so big, and the juristictional problem so large, it is hard for the police to deal with this. Many such criminals, set up their internet schemes in countries outside of US police juristdictions, and so can't be arrested. This is the advantage and the disadvantage of this new internet tool. One of the biggest problems in fighting crime today is that our courts and prisons are too crowded to handle all the criminals.