What are your thoughts regarding why arson cases are widely regarded as one of the most difficult crimes to prosecute?

Based upon your textbook reading, what are your thoughts regarding why arson cases are widely regarded as one of the most difficult crimes to prosecute? Name something that you, as an investigator, can do to improve the chances that your case will result in a successful prosecution.

Your journal entry must be at least 200 words. No references or citations are necessary.