There's nothing wrong with using legal language in a legal blog. Legal Terms like verdict, conviction, attorney, litigation, liability, plaintiff, defendant, perjury, legislation, and infringement are all words that reside in the collective usage.

Once you move beyond the usual legal language, you run the risk of alienating a lot of people. Of course, the use of overly-complicated legal terms ("Legal Jargon") may be unavoidable when discussing a highly complex areas of law. The use of Jargon really depends on the kind of audience you want for your blog.