[icedchai]

It is more common than you think. I've had candidates submit code samples with proprietary code from their current employer during interviews. One example: some files from a telco billing system. Right or wrong, there is essentially zero risk for this sort of thing.

[lkjdsklf]

There's certainly more than 0 risk.

I do hiring at my company. If a candidate showed me non-public code during an interview, they're an immediate no hire. Interview is immediately over. This isn't my personal preference or anything either. It's specifically in our interview training.

It demonstrates a clear inability to protect company IP. That's a big deal. Especially if you're a publicly traded company.

[icedchai]

It's near zero. Did you report the candidate for this? Actually, have you ever had it happen in any interview you've done?