neighbors harassing tenant

[Patricia Jubin]

There is a neighbor that has been harassing my tenant for the last two years.   We advised the tenant to get a restraining order which has run out.   The neighbor is now back to harassing him.   Police have been notified several times and the neighbor is only talked to.  My tenant has gotten a security camera and is very frustrated and angry.   A complaint with the D.A was also filed 7 months ago and nothing has been done.   I was told the neighbor is an informant for sheriff's dept therefore they do not do anything to stop the harassment.   This is only heresay so  I am not sure if this can be used In anyway.    I am afraid I will lose my tenant if this does not stop.  Any suggestions