There are numerous ways to make non-lethal traps and alarms. You can use several variations of lethal traps; such as the Malaysian Sling to slow down the "bad guys". You just don't want to put spikes on it or have it come around hard enough to kill them. Alarms are easy to construct from using soda cans filled with rocks to trip flares. I use trip wires with rocks to keep critters out of my garden, works some of the time. As far as cacheing goes there are numerous sites on the net that have information on it. You might want to consider guerilla farming for your gardening needs.
Offered by Mike G.