Pull you over, yes. Once they see the temporary registration in the window, they should let you go.
The opinions rendered herein are based on general principles of law. Laws vary from jurisdiction to jurisdiction and there are often numerous factors which can render advice or an opinion inapplicable. You should NOT make any decisions about the handling of a legal matter without first directly consulting with an attorney about the particulars of your case.
A traffic stop can be no longer than necessary. Any thing else and it becomes an outlawed fishing expedition. As soon as they checked the paper plates you should have been free to go. Now go get them and good luck.
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