This read-only TruthValue indicates whether the platform supports maintaining a dropped-packet counter in the Rules table for packets blocked by policy. An admin checks this to know whether they can rely on per-rule drop counters for monitoring how much traffic a given filtering rule is blocking, or whether that visibility isn't available on this platform. For example, an admin trying to quantify how much traffic an ACL rule is blocking would first check this object to see if a usable drop counter even exists on this device.