as the sensitivity of the metal detector decrease,does it become more likely or less likely that that machine will not sound an alarm when a weapon is present

We will have the following:
We will have that as the sensitivity of the metal detector decreases it becomes more likely that the machille will not sound an alarm when a weapon is present, we can see it partially depicted in the Specificity column whihc is the one that tells us about the deviation rate when it comes to detections.
This is due to the fact that the sensitivity has decreased, and thus some metals would be harder to detect.