1.  Congress doesn’t have to say what effect on interstate
commerce is, but helps.
2.  scrutiny:  Congress must have had a rational basis for concluding
that the activity has a subst. effect on interstate commerce
3.  US v. Morrison (overturned VAWA)
a.  facts:  Congress passed VAWA (violence against women act)
b.  held:  unC’al Act b/c outside Congress’ powers
c.  fails Lopez tests:
i)    not an economic activity (nothing commercial)
ii)    no causal connection btwn conduct (violence) & interstate
commerce
iii)    no jurisdictional hook (e.g. if P/D traveling in interstate
commerce and…).