I think for a Paladin calss to really work, a lie of any kind should be a wrongful act.
The very fact a paladin is a paladin should be why they are trusted to do the right thing including not lie. A white lie is still hurting someone.
Hornoring the truth, Good and Law is what makes a paladin and gives him/her special powers. There are ways aorund telling a lie as talked about eariler, but one way could be to simply tell the truth.
Child Example:
"Yea, I saw a child run in here and yea, I know where he went. Now you best all have a flippin' good reason for chasing him with weapons out or there is about to be an epic butt kicking. So what's your business with him?"
Guard example: "
I ain't got yuor toll, and even if I did, you stealing from others needs to end right now. So, give it some thought and either pull those weapons so I can show you how to use them, or continue on and change your ways boys."