What are possible consequences for failing drug test on felony probation

It could be going to jail to finish whatever sentence the judge originally handed down. If could be continuing your probation after sitting in jail for a certain amount of time. It's all going to be up to the original judge what your consequence is going to be.

Being warned

Being put on a higher level of probation

Locked up to a hearing and judge allowing you back on probation

Being sent to jail for a period,

Going to prison to searve the rest of your sentence