US Immigration Enforcement: Guilty Until Proven Innocent
In the United States, the legal system is supposed to begin with a presumption of innocence. If the government suspects someone of wrongdoing, it is up to the government to prove wrongdoing. The burden of proof lies with government agents.
But that’s not how the immigration system works. When someone is detained by immigration agents, it is up to the suspect to prove he is not a criminal. Otherwise, the suspect may be held for long periods without due process, or even deported.