How To Know If Someone Is Lying

Is there really such a thing as a "Good Liar?" Probably not but there are many, many people that try to do just that every day of their lives. My Wife knows when I lie every time. It's gotten to the point where I have to catch myself before I even attempt to do it.
I've asked her on more than one occasion how she's so good at knowing when I lie. Sometimes the pitch in my voice goes up, sometimes I can't make eye contact but most of the time it's my body language. Yes, I said it. Body language.
Now being a successful liar(there's no such thing)takes a lot of effort on anyone's part. Once the lie is told the liar has to cover their tracks completely for fear of getting caught. Some people always seem to land on two feet but the majority of us always get caught.
One way that I know of is if you ask the person(the liar)a question and they have a "ready made answer." It's as if they have rehearsed it over and over so it almost sounds like they're reading off a script. For all you woman out there that are dieing to know if their boyfriend or husband is lieing here's what i recommend.
1. If you have a feeling they're lieing let them know you're going to check into it. Just letting them know this will sometimes get them to "spill the beans."
2. Watch their eyes. As Tony Montana once said "They never lie."
3. Start lieing to them. Liars don't like to be lied to and will stop at nothing to prove they're a better liar than you.
4. Cry. Some people can't take it when another person cries because they know they're not telling the truth.
5. If you catch your significant other lieing or suspect them throw a fit and tell them you're leaving. Leave and go to the store or somewhere else that you can stay at for at least a couple of hours. Liars hate this one the most because they know they've been caught and if and when you do come back they'll have to tell you the truth.
Most of all, if you're in a relationship with someone you suspect of lieing to you get out of the relationship. Once a liar always a liar.