Shocking and revealing Buena Vista series. (5)

I believe the answer is:

taser

(Other definitions for taser that I've seen before include "Paralysing device used by police" , "Device used to stun someone temporarily" , "Shocking device used by the police?" , "The weapon delivers a temporary paralysing electric shock" , "Stunning device" .)

I've seen this clue in The Irish Times.

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