Many US states have made it illegal to own monkeys as pets and some have made it possible by obtaining a permit. It is hard to know all the laws for each state so it is best to check the laws for your specific state.
i take the fifth
No! they are social animals and need to be with their own kind.
as of now... no
A marmoset in a can, idiotic numbskull!
regular marmoset
yes and no if you took one out illegaly it is illegal if you bought one it is not illegal.
Yes, they're Illeagal because they're endangered
Either a license is required, or it's illegal to own a pygmy marmoset in Utah. Utah has a ban on private ownership of exotic animals. Source: http://www.animalsandsociety.org/assets/library/89_haddadcwapc.pdf (Page 42)
marmoset monkeys varriy in color
regular marmoset
pygmy marmoset habitat
Common marmoset was created in 1758.