|USB Killer device from USB Kill [https://www.usbkill.com]|
Here are some comments on Reddit about whether a suspect would be liable if the police seize one of these and fry the investigation computer / write blocker.
This device is not to be confused with the USB Kill Switch, that checks if devices are added or removed and shuts the system down. The USB Killer focused on physical damage.
Unfortunately, I've not seen more information on forensic forums about these type of devices. SANS and Forensic Focus have some short articles on it. The device looks like a normal USB stick. Be sure to check any USB devices before imaging.