@Arella Mae,
As long as your sheriff is keeping the criminal neighbor in the county jail you must be patient - he's obviously doing the best he can with such means as he has locally available. It's not fair to expect him to pay local taxpayers' monies to any private analysis labs, and bringing in the FBI at this point seems unlikely.
Again - all my best wishes, to you and family and of course to all your animals as well. Love and prayers are with you; have patience with the justice system