"Any tanker which tests positive for a drug residue is rejected and does not enter the market for human consumption. The full report is available online http://www.kandc-sbcc.com/nmdrd/fy-12.pdf "

This is an unfortunate distortion of the term "positive". Milk is tested and if the level exceeds the limit, it is deemed positive. The report you cite is spinning the data. Most commercial milk contains antibiotics, mostly below the tolerance limits. Most commercial honey also contains anti-biotics but is subject to far less scrutiny because it is not a staple food like milk. 

Here is an example of how the term positive is used in the literature:

> 5-Hydroxy-flunixin concentrations in milk samples were quantified by two commercially available screening assays – CHARM® and enzyme-linked immunoabsorbant assay (ELISA) – to determine whether any concentrations could be detected above the *tolerance limit* of 2 ng g−1 from different regions in the United States. Milk samples came from large tanker trucks hauling milk to processing plants, and had already been screened for antibiotics. *Positive results* for flunixin residues based on a screening assay were confirmed by ultra-HPLC with mass spectrometric detection. Of the 500 milk samples analysed in this study, one sample was found to have a 5-hydroxy-flunixin concentration greater than the *tolerance limit*.

Source: Kissell, L. W., Baynes, R. E., Riviere, J. E., & Smith, G. W. (2013). Occurrence of flunixin residues in bovine milk samples from the USA. Food Additives & Contaminants: Part A, (just-accepted).

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