I think everyone should read the laws that govern their lives. Read up, TOKERs. Pay special attention to the 2nd link, which outlines a section added during a renewal that should scare the fuck out of you.
Sec. 3056A (b)(1) (B) states that the newly created United States Secret Service Uniformed Division has the power to:
make arrests without warrant for any offense against the United States committed in their presence, or for any felony cognizable under the laws of the United States if they have reasonable grounds to believe that the person to be arrested has committed or is committing such felony;