Yeah, measuring run off in soil is like asking a dealer to tell you exactly what stuff they are selling, they might think its coke, they might suspect its Nep, but in the end it could just be Hexen.
It just doesn't always work out well, but if your plants are growing without issues then you know deep inside that you need coke, WHERE IS THE FUCKING COCAIN MF???!!!!
Sorry, it happens sometimes.
Don't do coke, just mail it to....