You may want to reach out to folks like these for guidance on where its allowed (not many places) and where it is allowed what areas do best and what equipment they recommend. The beaches in North Jersey for instance the days after Superstorm Sandy were apparently a good place to be to find items churned up from underneath sand layers. Metal Detecting is definitely not allowed in State Forests, State and County Parks, Wildlife Management areas and private property without permission from the owner. Good luck!
Ah, ok then - sorry. Hope you enjoy your next visit to the US. As Pinebarrens Advocate wrote above, the use of metal detectors is illegal in many places so you need to check the local laws before using one.
You are allowed to detect Atsion beach with a permit and thats about it.All treasures are to stay buried forever till they decay into oblivion because once you drop it the state owns it so please hold onto your cell phone.