All law enforcement officers - such as police officers, county sheriff officers, investigators in a district attorney's or an attorney general's offices and highway patrol officers - can arrest you whether they are on or off duty, in most cases. A probation or parole officer also can arrest you.They can arrest you - even if they do not have an arrest warrant - if they have probable cause or good reason to believe you committed a felony, such as armed robbery. (A felony is a crime of a more serious nature than a misdemeanor, usually punishable by imprisonment for more than a year.) They do not have to see you commit a felony in order to arrest you. They do, however, have to see you commit a misdemeanor in order to arrest you. If you commit an infraction, instead of taking you into custody, they may ask to sign a citation or notice. This is a minor offense, such as a moving violation, where the punishment usually is a fine. If you sign the citation, you are not admitting guilt; you are only promising to appear in court. If you have no identification or refuse to sign, however, an officer may take you into custody.