side thereof the leads 68 are connected to the respective ends of the switching element 30 as by solder joints 76 the solder joints 76 are preferably insulated from the frame 16 by conventional shrink sleeves in the manner described above relative to the solder joints 64 after the circuitry is placed into the frame 16 a liberal amount of a silicone or other sealing compound is pumped into the frame 16 through the elongated opening 74 to form the mass 57 the compound thus entirely seals the circuitry at the lower end of the screen it may be smoothed at the opening 74 to provide an outer surface which is substantially flush with the outer surface of the frame 16 it will be noted from the above discussion that all points of electrical connection in the screen circuit are encapsulated in sealer within the frame 16 and are therefore entirely protected from corrosion or shorting due to moisture the same structure helps protect the wiring and the electrical switching element 30 from damage if the frame 16 is accidentally bent or struck and prevents an intruder from tampering therewith the screening material 18 cannot be removed from the channel 26 by an intruder without breaking the circuit and setting off the alarm 15 because the wires forming the sensing circuit pass into and are secured to the screen frame further attempted removal of even the spline 20 from the channel 26 for the purpose of removing the screening material from the channel causes the wires bonded to the spline to be ripped or broken setting off the alarm a conventional bug screen can be easily retrofitted to produce the security screen of the instant invention by heat sealing or cementing the wire 28 onto the.