Bribery is not a reliable way of obtaining info as unless the person providing info stays within the perview of his "contacts" he can take money for false info and fade into the crowd. And once a person is bought, there is no reason to believe that he can't be bought by the other side. That person may also be working for the other side providing just enough to be a good source but providing disinformation as well. THe only way it works is to have several sources offering the same info that can be corroborated. That gets rather expensive and is still not that reliable. None of this is to be construed to exhonerate using torture.