This month's "Mining Movies" looks at Blade Runner, Ridley Scott's film set in the year 2019. It is a sad time for Earth, which is in the midst of environmental degradation so severe that other planets are being prepared for colonization. The main source of labor for this preparation work are "replicants," organic robots that look and behave like humans, except for their inability to express real emotions. They have been banned from Earth because they staged a revolt in one of the colonies. Enter Harrison Ford as detective Rick Deckard. He is a "blade runner," a cop who specializes in determining who is human and who is replicant. It is up to him to enforce the ban. Computer technology appears in Blade Runner as many futurists of today predict it will: invisibly. It is implied, but rarely overtly shown, except for one particular piece of technology that Deckard uses to catch the bad guy--in this case, a rogue replicant. This technology is briefly described in this article.