When I google search ["law and human behavior"][1] (with quote marks) I get only 106,000 hits. When I search ["law and human behaviour"][2] (again, with quote marks) I get 25,200,000 hits. 

I don't have any prejudices about the American vs English spelling, but 
the journal is really called "law and human behavior" (see http://www.springer.com/psychology/psychology+%26+law/journal/10979). Furthermore a search for the word "behavior" returns about twice as many hits as a search for the word "behaviour".


  [1]: https://www.google.com/#q=%22law+and+human+behavior%22
  [2]: https://www.google.com/#q=%22law+and+human+behaviour%22