Take the following as truth: In answer to the objection that urine tests reveal only very recent use of hard drugs, Bruce Reed says that before long, drug-testing technology will have advanced from urine to hair tests, which may reveal chemical traces for up to a year.
Then the following statement: "Hair tests are more difficult and more expensive than urine tests, by are more effective." is true, false, or inconclusive?
Answer: Inconclusive