Any probation department can utilize the technology of ETG whenever they want. ETG tests are not something that are done "in house," they are sent out to the lab. Therefore, all they would have to do is order one of those tests form the lab that they send out to.
Often, unless specifically ordered by the judge, most probation offices dont do them as they are expensive (although you ultimately will incur the cost) and they take up to 3-5 days to get the results. Therefore, they simply rely on stick tests and breath tests. However, if you are a multiple offender involving the use of alcohol, they may do it due to your track record.