a synth detector arch way

[howiebabey]

Have a modified version of the decontamination arch to be turned on  permanently so that all visitors,settlers that pass through it that are synths turn hostile to everyone thus causing all turrets,settlers to terminate it. This would fix the synth saboteurs problem Of course esl option is nice. 

[BlazeStryker]

One of Loot Detector's powers is that pointing a weapon at a synth will reveal it. I mention this because it should be possible to create a opening/doorway that does the same thing. Set them up at choke points with the turrets well-placed and your problems will take care of themselves. (This method would require Loot Detector, naturally)