Today's Times has an article on a drug trial gone wrong which begins,

In February, when Rob O. saw the text message from Parexel International pop up on his cellphone in London — "healthy males needed for a drug trial" for £2,000, about $3,500 — it seemed like a harmless opportunity to make some much-needed cash.

Does this really sound harmless? Text message spam promising reward money if they poor some unknown chemicals in his body and observe the results?