Having Bridget and I both being proficient with detecting deception (and also both FACS certified) keeps our kids honest! We have 3 kids living at home: Callan, Alex and Caitlin. The kids are much more likely to be honest straight away (what everyone encourages of course, however often the natural tendency would be to either flat out deny or blame someone else). If a lie does come out, it doesn’t tend to last long before being uncovered.
It has taken me a long time to be able to switch off seeing “everything” at home, with a general rule at home that Bridget & I try not to analyse each other. I’m not talking about deception, rather the micro expressions, body language and voice cues that alert me that there is a variance from the normal baseline. I find that for the most part I can switch off, however sometimes I find it really challenging to notice a subtle mood change with Bridget and not say anything.
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Stu Dunn Blog 
How do I get FACS certified?
To become FACS certified, you purchase the manual (comes on a CD), go through the manual, then pass the final FACS test. There are also 5 day FACS workshops available in various places around the world to speed up going through the manual – however even with these, you still have to purchase the manual from here: http://face-and-emotion.com/dataface/facs/terms.jsp