There could be a number of reasons why a bail bond could be revoked.
When a person is out on bond, they are released under certain conditions set by the Judge. Those conditions can range from having to get weekly drug tests or being on GPS monitor, or staying away from some individuals. There are a great deal of various pretrial conditions that a judge may feel is appropriate for a type of case.
Some individuals out on bond are monitored by pretrial services. They must report and show compliance to a pretrial officer.
If that person fails to follow those conditions, the pretrial officer will write a violation report to the judge, and the judge will decide what action, if any, to take on the violation report. The judge may continue the same conditions and do nothing, add more conditions, increase the bond amount, or remand a person without bond.
When the bond is increased or the person is remanded without bond, a warrant is issued for that person.
The State sometimes may feel there is a specific reason for asking the judge to revoke a bond. Sometimes, the State may feel that the defendant has threatened or may pose a danger to an alleged victim or society in general. In those circumstances the State files a motion requesting that the bond amount be raised. If the Judge follows that request, then a warrant will be issued and a new bond amount will be set or that person could even be remanded without bond.