VPNs and the law: How often does law enforcement actually request VPN logs?

VPNs, when managed properly, are a great way to protect your privacy and keep your online activities hidden from prying eyes. But not all VPN services maintain the same security standards or take the exact same approach to user privacy. How does your VPN handle your data? When the police or governments come knocking, what does your VPN do? The history of law enforcement subpoenas of VPN logs is murky to say the least. Major VPNs can get hundreds of data requests per year, but what they turn over...