Priestly uses Mrs Birling's discomfort at having a Police inspector refuse to obey her as an example of the wealthy middle and over classes complacency when it comes to the law
MrsBirling is hypocritical - 'if he'd be entirelyresponsible' but later says 'I didn'tknow it was you' when talking about the father of eva's child but then finding it's eric's.
Both Mr and MrsBirlingnamedrop people they know in the police expecting the inspector to give them an easiertime (when peopleuse their connections to avoidprosecution it's calledcorruption)