Why is the THC test line faint on a drug test？
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Factors Affecting Test Reagent Reaction:
Several factors can influence the test reagent's reaction, leading to a faint test line. These factors include:
Urine Specific Gravity: Diluted urine can lower the substance concentration, resulting in a fainter line.
pH Levels: If the sample's pH is outside the normal range, it can affect the test's reactivity.
Recent Medication Use: Some medications can interfere with the test results.
Sample Temperature: Always use a fresh human urine sample, and the test should be performed at room temperature.