This is an important update from Apple and a solid step toward better security for iOS devices.  Much is made of this update relative to the actions of law enforcement agencies in obtaining information from seized devices.  That is not the only story or the only reason this update is relevant.  It is a genuine protection against sidejacking and other malicious intrusions that can occur from many others outside of the realm of the FBI or your local police department.

Review your devices and patch accordingly.

https://www.theverge.com/2018/7/9/17549538/apple-ios-11-4-1-blocks-police-passcode-cracking-tools