How the violation process works
A violation usually starts when a probation officer reports to the court that a condition was not met. In New York this is often done through a declaration of delinquency, which can pause the running of the probation term, and the court may issue a summons or a warrant. At the hearing there is no jury, and the standard of proof is generally lower than at a criminal trial. You usually have the right to counsel, to see the evidence, and to contest the allegation. Some violations are resolved by admission, but that is a decision to make after reviewing the evidence, not at the first appearance.
When a new arrest is the violation
A new arrest can be the basis for a probation violation even before the new case is decided. That puts two proceedings side by side, with different standards and different judges, and what you say in one can affect the other. Testifying at a violation hearing about the facts of a pending new case, for instance, can create problems in that case. Decisions about the violation and the new charge usually work better when made together, so both should be in front of the same counsel or coordinated closely between lawyers.
What the court can do, and how to prepare
The options typically range from continuing probation as it was, to adding conditions or treatment, to revoking probation and imposing a new sentence within what the original offense allowed. That is why the original charge and plea matter so much at this stage. Gather proof of what went right as well as what went wrong: program attendance, employment, housing stability, and treatment progress. A judge deciding what to do after a violation often looks at the whole period of supervision, not only the incident that triggered the report. If you have an upcoming appointment with your probation officer, keep it, and ask your lawyer beforehand how to handle questions about the alleged violation. Federal supervised release runs under its own rules and procedures, and we look at those separately if they apply.