The basic premise for " Blood " evolved from three topics : co-writer Glen Morgan 's own hematophobia , the controversy over malathion spraying in Southern California , and a somewhat vague idea that Morgan and his writing partner James Wong had about focusing on postal workers . After series creator Chris Carter expressed his desire to feature a story revolving around digital readouts , Morgan and Wong decided to combine their disparate influences with the digital readout idea , eventually producing a script that turned " new technolog ies " ( e.g. fax machines and cellular phones " ) into something " scary . " Morgan and Wong also based the episode 's climax on the 1966 University of Texas tower shooting . Of note , this scene was only partially filmed at the University of British Columbia because firearms were not allowed on location at the actual university . This necessitated that a replica of its clock tower 's interior be constructed for use in several key scenes . This episode marks the first time that Darin Morgan , Glen 's brother , helped with an '' X-Files '' script . Darin had been asked to help flesh out the episode 's story , and he would later write the second season episode " Humbug "
University of Texas tower shooting
University of Texas tower shooting
Blood (The X-Files)