I. General requirements
137
1. Clear and specific statutory basis
137
2. Proportionality
141
II. Standards for data collection and processing in the form of strategic
surveillance of foreign telecommunications
1. Strategic surveillance can be justified in principle
142
143
a) Legitimate aim, suitability, necessity
144
b) Proportionality in the strict sense
145
aa) Weight of interference
146
(1) Covert telecommunications surveillance
147
(2) Limited precision
148
(3) No direct follow-up measures against affected persons
149
(4) Indiscriminate effect given current realities of communication
150
(5) Targeted surveillance of individuals
152
(6) Traffic data retention
153
bb) Exceptional justification of powers not subject to any thresholds
154
(1) Impermissibility of domestic surveillance not based on specific
grounds
155
(2) Justification through the specific nature of foreign surveillance
157
(a) Gathering intelligence prior to surveillance targeting individuals 158
(b) Conditions under which foreign surveillance is conducted
159
(c) Necessity of foreign surveillance given the current realities of
communication
161
(d) No direct operational follow-up powers
165
c) Summary
166
2. Specific requirements regarding the design of the statutory framework
167
a) Overarching aim: Limiting and structuring data collection and processing in accordance with the rule of law
168
b) Removal of telecommunications data of Germans and persons
within Germany
170
10/87