(a) What obstacles are encountered, and how do Member States overcome them, in the field of international cooperation regarding investigation and prosecution in money-laundering cases, including the seizure and confiscation of proceeds of crime?
(a) 在调查和起诉洗钱案件包括收缴和没收犯罪所得的国际合作领域遇到了哪些障碍，会员国如何克服这些障碍？