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That sounds like a "fail" for cannabis, but this depends on the specific measurements and the cutoff values for whomever they are testing for.
Here in the US, there are defined cutoff levels -- so if there is a trace amount of THC/marijuana, but it is under this cutoff level, then it is considered negative.
The fact that there was 0.03% THC/cannabis means that they did detect the use of marijuana over the past three months.
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You could simply just ask to see the official results from the lab itself -- there will be the cutoff values listed on the report.