Used a decently small amount of heroin for the first time in 6 months. Have a probation test in about 13 days. Is there any possibility that I will fail this test? It will most likely be a urine or saliva test.

Am 160 pounds and pretty fit. Have been drinking about a gallon of water a day now.

How long is it detectable at the LOWEST cutoff level. The cutoff level being the level that they would use for probation drug testing in California