Are you able to explain this question?

MLATS between the U.S. and foreign governments establish procedures by which evidence may be obtained from foreign nations. MLATS allow federal prosecutors to request that foreign law enforcement officers gather evidence in their countries for use in U.S. proceedings. MLATS offer the advantage that: a.Investigators may use a letter rogatory in conjunction with the MLAT to speed up evidence gathering b.Compliance on the part of signatory nations is mandatory c.Foreign authorities may honor a request by using evidence-gathering tools allowed them by their own laws

d.They require the actual involvement of U.S. officials in the foreign investigation