The treaty has been claimed to be one-sided because it allows the US to demand extradition of British citizens and other nationals for offences committed against US law, even though the alleged offence may have been committed in the UK by a person living and working in the UK (see for example the NatWest Three), and there being no reciprocal right; and issues about the level of proof required to extradite from the UK to the US versus from the US to the UK.