A person who makes a citizen's arrest could risk exposing him or herself to possible lawsuits or criminal charges – such as charges of false imprisonment, unlawful restraint, kidnapping, or wrongful arrest – if the wrong person is apprehended or a suspect's civil rights are violated.[3] This is especially true when police forces are attempting to determine who an aggressoris.
另外,看各州法律,规定不同。security 代表公司,是否在这种情况下可以拦是很tricky 的。
https://en.m.wikipedia.org/wiki/Citizen%27s_arrest