My 4 year old is telling me that my 11 year old put his peepee in his butt. Now he’s saying my 11 year old told him to open his mouth so he can put his peepee in his mouth. My 11 year old lie’s so much it’s hard for me to believe him. At first I thought my 4 year old was just making up stuff but he said it again and add some new stuff. So can my 11 year old take a lie detector test?