Can a rigger control a drone via Remote Control or by Jumping In after the drone has already acted on its own that Initiative Pass?
No, a drone may only act once in a single pass in any control mode. After a drone has acted on its own in an Initiative Pass, all a rigger can do is perform a Change Link Device Mode (p. 228, SR4A) simple action on it to switch the drone out of autonomous mode. The drone will then wait for instructions from the rigger in the next Initiative Pass.
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