HelloCustomerand welcome to JustAnswer.
If you mean someone who is still a juvenile being prosecuted as an adult, depending on the circumstances, yes it is possible. The primary factors that would go into a decision to prosecute a juvenile as an adult would be the seriousness of the offense, the age of the defendant and his criminal
history, if any. Under Arkansas law, juveniles as young as 14 can be prosecuted as adults.
If you are referring to an offense that was committed when the person was a juvenile, but that person is now an adult, the answer is still yes, but any sentencing would normally be handled the same as it would have been had he been prosecuted as a juvenile (unless, of course, the original offense would have justified prosecution as an adult, as described in the previous paragraph).
Thanks for asking your question here on JustAnswer. If you have any other questions, please let me know.