On Friday, Lord Timpson in a statement said: “In recent weeks I have been pushing Serco to sort the outstanding backlog in tagging offenders promptly. I am pleased to say this has now been reduced to normal levels.
"I will continue to hold Serco to account and will not hesitate to impose further financial penalties should its performance drop again”.
Serco is the security contractor which manages the prison tagging system.
But probation staff say this week they were told by the government that the backlog of offenders who needed to be tagged had reached "acceptable levels". But the government has not defined what that exactly means.
One probation officer said: “Does that mean 90% have been tagged or 50%? These problems have been going on for months and if they’ve just sorted the backlog, that doesn’t mean they’ve sorted the problem.
“Our workload is at ridiculous levels already and we’re being expected to do stuff like breathalyse people because they haven’t got an alcohol tag. We shouldn’t be doing this”.