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It was only a matter of time ... but a Howard Stern fan managed to infiltrate the Christopher Dorner news coverage by posing as an expert ... and PRANKED a Los Angeles TV station live on the air.

The caller got through to KCBS-TV moments ago claiming to be a State Fish and Game ranger named Mike Taugher ... and he was SUPPOSED to recap the events leading up to the shootout.

It started out pretty believable ... but when the caller name-dropped Ronnie The Limo Driver (a Stern regular) it was pretty clear CBS has just been hoaxed.