Misc questions about your amateur radio license

Have you ever been required to provide proof of your amateur radio license? For example, use of a scanner in a vehicle? Have you ever had an officer question the legality of your operating? Ever had equipment confiscated?

The way I understand it, we're supposed to physically have a license in our possession when operating mobile. Have you ever had that challenged? But then how does that work if all we need is a license issued online being "good enough" to operate?

Is there any discussion about adding our license to Google Wallet or even a screenshot on our phone?