Nevertheless , human infiltrators are still common today .
Fielding operatives is very expensive , and for governments with wide - reaching electronic surveillance tools at their disposal the information recovered from operatives can often be obtained from less problematic forms of surveillance such as those mentioned above .
Human infiltrators are still common today .
Fielding operatives is very expensive , and for governments with wide - reaching electronic surveillance tools at their disposal the information recovered from operatives can often be obtained from less problematic forms of surveillance such as those mentioned above .