This is the 4530th most frequent German word.
polizeilichen
"Polizeilichen" means "police-related" or "pertaining to the police."
In this sentence, 'polizeilichen' is used as an adjective modifying 'Vorschriften' (regulations), indicating that these regulations pertain to the police.
Die polizeilichen Vorschriften müssen eingehalten werden.
The police regulations must be followed.
Here, 'polizeilichen' describes 'Maßnahmen' (measures), signifying that these measures are implemented by the police.
Er engagiert sich für die polizeilichen Maßnahmen zur Sicherheit.
He is committed to the police measures for security.
The word 'polizeilichen,' as an adjective, qualifies 'Ermittlungen' (investigations) to refer to those conducted by the police.