Electric fences are non-lethal, yet do provide an active deterrent. The advantage of electric fencing is that it gives the potential intruder a nasty shock and secondly sounds a siren alerting you that somebody is at your perimeter.
An additional advantage is that the energiser can normally be linked to your interal house alarm, so that armed response will be alerted as well. The linking of the electric fence to the armed response has to be done by your alarm company as they need to zone the fence into their alarm system. Palisade fencing is an effective deterrent and asthetically pleasing. It is a durable perimeter barrier against intruders and an investment to your property.