Thanks, but what do you make of two separate manufacturers strips with opposite results? One with two solid lines and the other with only one line. Both tests done at the same time using the same sample. And on one strip you almost need to use your imagination or hold it at certain angles to see it?
Too bad that you didnt post any pics of these tests. That wouldve been a big help in answering this.

Rule of thumb - if it can be photocopied, its a line.

Are the comments I've read that say " a very faint line demonstrates thc levels at or near the cutoff? Is this totally bogus?.
Yep. Because to conclude this as such would be sheer speculation, as assays lack the ability to yield a quantitative value (unlike the GC/MS).
And again, if this was actually true, then like Ive pointed out before, synthetic urine controls and your tap water tests (again both specimens containing zero drug metabolites) wouldnt be producing faint lines on an assay.

If I was the lab I would question such a faint line and find it hard not to find it positive when it is so hard to see.
Even if an untrained tech were to misinterpret a faint line as a "non-negative" and sent the sample off for the confirmation GC/MS, the sample would come back as a negative.

Also, are these dip strip test considered "EMIT" tests?
The dip tests function on the same principle as the EMIT, as they utilize enzyme-based reagents for the analyzing process.