What happened during the last bomb that target a vehicle for the American embassy in al quarantine highway was because of this?
Who would know and do a security surveillance against a diplomatic personality else but Hezbollah.

During work in Lebanon we learned to never count on a previous day road check being done by internal security forces cause 90% of them lack the training and experience in doing this jobs and most of them are just big bodies with no logic or intelligence just an armed scary figure nothing more nothing less
And never count on internal security forces escort-help or their advises cause most of them are breached and have ties with militias that they might be a potential threat against any VIP we escort
Or even allowing them to carry their personal mobiles a day prior to the mission

Lebanon territory is very dangerous and manipulating and it teaches a lot and helps you be creative about genius techniques especially against the threat of hostile groups like amal and hizballa and others.