Plasma ball: Are there any safety issues associated with using a plasma ball in the classroom? Sources on the internet seems to give conflicting information and I would appreciate some clarity.

Plasma ball: Are there any safety issues associated with using a plasma ball in the classroom? Sources on the internet seems to give conflicting information and I would appreciate some clarity.
Decomposition of organic matter: I
Information for the use of lasers in schools.
This set of downloadable documents detail standard operating procedures for the use of lasers in schools.
This downloadable resource safely explores electrical short circuits.
This online resource deals with health and safety in the workplace.