Can I use USD$ in Bolivia & Peru?

A lot of places in Bolivia and Peru will accept USD$ and you can even get US currency out of some ATMs . You should be aware though that the banks are very strict on the condition of the USD bills and will refuse to accept any with even the smallest rips in them or if they are dirty or in a generally worn state. Because of this businesses will also be very likely to refuse them also - it tends to be stricter / fussier in Bolivia than Peru. Additionally some series of bills (such as CB and B2) are not valid in Bolivia due to concerns over counterfit money or money laundering.