Yes, I am coming right about and saying it. Most people with ADHD do not make good liars! Some people with ADHD can and do come up with some very believable and sometimes even great lies. Manipulation can often be a strength for people with ADHD. Just look at how many adults with ADHD are in sales, marketing, and politics.
Being a good liar takes more than just coming up with a good lie. It's takes careful planning and remembering! Liars need to remember exactly what lie they told and which people they told the lie to. If you can't remember where you put your keys or when to pay your bills you probably won't remember all the details required to be a good liar.
Also, most people won't call you out on your lies either. Just because you didn't "get caught" doesn't really mean people believe your lies.