Metal Detecting should be a heavily relied upon scientific tool for Archaeology. I graduated with a Bachelors of Science in Geology, double majored in Geology and Archaeology. It's almost like detecting and relic hunters are the scum of the earth to them. The fact of the matter is, most history hunters (detectorists, and the like) are the reason things get found for the world. Sure, some academic/professional archaeologists are using MD'ing for artifact location, for the most part though it was blacklisted. At least to my mentors in the field. Here is how most studies take place. Site location or significant find or future destruction of site, funding, staffing, ground survey, grid sets, test pits, further test pits if multiple artifacts found, if that pans out, then full on 1x1 M blocks dug. Now if there is a body or a significant site they might go ahead and just do full pit excavation of the site right then and there. Then cataloging of artifacts, and curation. It feels like the old school Royal Academy of Science, where a far flung not very accepted idea was laughed out of the smoking room only to later be a forefront primarily used technique in the future. Even with historical non-prehistoric sites, test pitting and excavation is the preferred method, flotation techniques etc. Depending on what I was expecting to find (if I had a professional/academic job in the Arch world) I would definitely utilize Detecting to locate metallic artifacts. I think they are just coloring in the defined lines. To defend the archaeology world though, they do a good job and sometimes utilize detecting. Most bodies and bones are returned to the nearest affiliated tribes if they are Native. Legally they have to do it, some tribes have opted to leave them in place non disturbed and construction is done around them. A park in Louisville Kentucky had to leave the remains in and build around them about 15-20 years ago. A lot though are returned and a ceremony takes place and cleanses them and returns the remains to another location so the ancestors can be at peace.
Edit: I'm a detectorists and an avid proponent of historical preservation. I respect the past and love it. If an artifact is going to sit in a box in a museum (or Sitting Bull's skull in freaking frat house in Harvard (thanks George Bush Senior)makes me vomit) I'm all for it being protected instead, returned to the family, or loved and cared for by an avid history hunter. I don't want a projectile point or pot shards to be given a number and forgotten, return them to the ancestors or revere them in your home and family.