As for Nelson's claim that high test levels can result within hours after administration, there's a simple expanation for this.
Even though the test is administered into muscle tissue, and it's relatively hydrophobic (it'd rather be in fat than blood), it is still capable of getting into the bloodstream in it's ESTERIFIED state.
Now, depending on how it is done, the blood test probably does not discriminate between the test ester and the free test forms. Therefore, the test results probably just report the sum total of all test.
Any doctors around that can explain the method behind blood tests?