The CSI's discover the apartment's circuit breakers duck taped in the ON position to keep from disconnecting the overload. Circuit breakers are designed and required to open even if the handle is jammed. They must be switched to the OFF position to reset them. To bypass the breaker would require removing it and hot-wiring the contacts. If an unqualified person tried this, they would probably be found, electrocuted, in front of the panel.
When Ryan shows the writing on the back of the photograph under ultraviolet light, the caption on the screen says that it is "ultraviolent light".