From the same article above, very interesting :
Ethnicity and Gender
In addition to eye movement being inconsistent with speech cues, ethnicity and gender may also have an impact on assessing credibility and deception.17 Julie Lavigne, in a presentation to the American Psychological Association 2008 Convention, suggests that interactions between police officers and ethnic minorities are likely to be challenging. Interactions are characterized by mutual distrust and misinterpretation of cues, as well as misunderstandings regarding the actual meaning of the behavior exhibited.18
Ethnic and culture-related behaviors can be compounded with cues one uses to detect lies and might be misinterpreted by police officers as an attempt at lying even when the person questioned is not engaging in deception. Although research has shown that ethnic groups influence one’s own nonverbal behavior during interactions with others, few studies have examined the influence of ethnic groups on behavioral cues to deception. The lack of insights about the effects of ethnic groups on deceptive behavior is particularly striking . . . . Behavioral cues to deception are influenced both by individual (that is, ethnic groups) and contextual (that is, phase of investigation) factors. For this reason, detecting a suspect’s deception by means of their behavior is likely to be challenging and misleading for police and scholars.