Lying Is Too Easy These Days

It has always been this way in trials for people on the stand - although many of them (especially those defendants who agree to testify, even though they don't have to) put their hand on the bible and answer the question, "Do you solemnly swear or affirm that you will tell the truth, the whole truth, and nothing but the truth, so help you God?", it is pretty obvious that responding "yes" is only the first of any number of lies soon to come out of their mouths.
Take for instance the current trial of Jodi Arias vs Arizona. She has been on the stand for weeks testifying to what she knows & doesn't know. She is a proven lier-that's a fact caught on tape by the police. And we're supposed to believe anything she has to say while she's on the stand? It seems very convenient for her that in her testimony 99% of what she says paints Travis Alexander (who she admits killing) as a sex-hungry pedophile who attacked her causing her to kill him in self-defense. And according to her word she should only be given a slap on the wrist for her crimes because none of it was really her fault.
It's a shame that she thinks we're so gullible that we'd fall for this. She must really think that people are either stupid or that her charms can just win over everyone. She's not the first to try this, nor will she be the last.
In the trial of James Holmes vs Colorado the judge has made a ruling that he be given truth serum when interviewed to see if he really is mentally deranged (or just faking it). Many oppose this decision. I personally don't know if it will work. What we really need I feel is something better than this truth serum.
What we need in court cases is some sort of device that can read the person and tell if they are lying & alert us to this fact. Perhaps something we've already been using in other capacities - DOGS!
Yes dogs could be the answer. They are used to detect things we humans cannot see, or hear, or smell already. (like hidden drugs). They also in some cases seem to be able to detect things in us that we cannot see. For instance, they can alert people with medical problems who occasionally have seizures of an upcoming episode, so that they can prepare themselves by lying down or something. I've also heard tell of dogs in hospitals who can detect when someone is going to die soon.
Things like this prove that dogs have sensory abilities that we do not & that might be utilized more extensively - like perhaps to detect lying.
Imagine a courtroom where next to the stand sits Fido, the truth detecting canine, who is given a treat when he senses someone giving false testimony. Oh, what a world that would be.