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Polygraph, inozivikanwawo se "lie detector", chishandiso chinogona kuona kana munhu ari kunyepa kana kwete. Chinoongororawo kurova kwemoyo wake, kufema kwake uye tembiricha yeganda kuti chione kana zvichiita sekunge ari kunyepa. polygraph mudziyo haarevi kuti haakanganisi asi ave achishandiswa kwemakumi emakore akasiyana-siyana nemapurisa.
Cole akanga agara asarudza kuti panofanira kunge paine nzira iri nani yekuziva nhema - isina kukanganisa kwemunhu. Kwemakumi emakore, yagara ichishandiswa kubatsira mapurisa nemasangano ehurumende uye kunyange mamwe mabhizinesi mukuita sarudzo dzakakosha.

Ehe, havasi vese vanotenda zvechokwadi polygraph mudziyo kumira mudare redzimhosva. Kunyange zvazvo ma polygraph ari chikamu chekuferefeta kwemapurisa, nyaya dzemumatare hadzibvumiri mhedzisiro yebvunzo idzodzo nekuti dzinogona kunge dzisiri dzechokwadi. Izvi zvakakonzera kusava nechokwadi kukuru munharaunda yesainzi pamusoro pekuti michina yakadaro inogona here kuona nhema.

Ngano dzinonyanya kutaurwa pamusoro pebvunzo yesainzi, uye zvinorehwa nesainzi nezvadzo. Zvidzidzo kubva munhoroondo. Nzira inoshamisa yatinoziva nayo kuti ndiani akabika zvinhu zvehupenyu musobho yekare.

Kune mhando dzakasiyana-siyana dzenyaya dzakadai dzekukunda polygraph asi kazhinji idzi dziri nhema chete. Kungoti mumwe munhu anoda kuti muchina upe mhinduro chaiyo hazviite kuti ufunge kuti kuedza kwacho ndekwechokwadi kana vakangotarisa pakuita zvinhu zvakanyarara uye zvakanyarara panguva yebvunzo. Zvisinei, polygraph mudziyo vakadzidziswa kuona hunyengeri uye izvi zvinosanganisira zvinopfuura kungotarisa maitiro emuviri chete. Saka, kunyange zvazvo munhu achigona kufunga kuti vanoziva nzira yekukunda cheki yepolygraph, hazvisi nyore kudaro.