Elite Enforcers are same as regular Enforcers, except that they have armor.
Enforcers (and Elite Enforcers) can investigate their interest point by throwing a Scan Grenade near it. When thrown, the scan detects agents in a radius of 6 tiles. The scan is blocked by tall cover and hard cover, but not soft cover. In Endless and Endless Plus modes, starting from day 13, scan grenades also deactivate cloaking effects and Archive Prism's Holo Projection Mesh on agents within the scan radius.
Enforcers generally throw a Scan Grenade to investigate a “fresh” interest point that is sufficiently far away from them, once they have moved into line of sight of it. If the scan detects an agent, the Enforcer's interest point is updated to the agent's location. If multiple agents are within the scan radius, only one is located. Otherwise, if no agents are located, the interest point remains unchanged. Either way, after throwing a Scan Grenade they will subsequently investigate their interest point in the usual way (by moving to it and peeking) rather than by throwing another Scan Grenade. However, if the Enforcer receives another “fresh” interest point before this, then they may throw another Scan Grenade.