Even though ARPA does not specifically mention "metal detecting", you need to understand what ARPA says about digging artifacts.
In addition to the above mentioned ARPA law, if you are metal detecting in New Jersey, you must be aware of another law,
the National Historic Preservation Act. (NHPA)
The following story was told to me by an individual who lived in New Jersey. As always, I will not divulge the participants names because I respect each individuals privacy.
A 71-year-old war man was metal detecting an area of New Jersey State Land. He was given the metal detector on Christmas, by his wife the year before. He had used the detector only twice
in a local park. However this time he thought he would venture to an area he used to hunt deer on. He remembered seeing old cellar holes and thought it would be fun to metal detect around the cellar hole.
After about half-an-hour of detecting the gentlemen was approached by a Conservation officer. The officer told the man that he was breaking the law by metal detecting on State Land.
The officer asked the elderly man to show him what he had dug. Of course the kindly gentlemen was upset, not knowing that he broke a law, and handed the officer a 1879 Large Cent that he had dug a few minutes earlier.
The officer told the man that he was going to arrest him and confiscate his metal detector and his coin. Visibly shaken, the gentlemen was placed into the State vehicle the Conservation officer was driving and taken to the local jail.
Through this entire ordeal, the elderly man kept insisting that the Conservation officer show him the law that he broke. Of course the officer had no written law on him to show the man.
That evening, as the elderly gentleman sat in jail waiting for his attorney to arrive with bail money, he suffered a heart attack.
Fortunately, he survived the heart attack, but he ended up paying $5000 to the State of New Jersey for breaking the ARPA law.
By the way, no one knows how the State of New Jersey arrived at the figure of $5000.
An explanation by the State asked by this mans attorney, never came.
As confusing as the above laws may seem, if you are metal detecting in New Jersey,
Do not dig anything that you believe is an artifact, or anything that is older than 100 years.
Especially if you are on any State Lands.
If you want to detect on private property, then be sure you get written permission from the landowner.
For detecting in New Jersey, town, village and city parks, you'll need to check with those local officials.
I cannot be responsible for any outdated laws from the time of this posting.
Have you tried metal detecting in New Jersey ghost towns?
Be careful you don't break any laws!