Why did the federal police come to arrest Quaid and why was the operator at Recall killed?

Assuming we're talking about the 2012 Total Recall. The SWAT team arrives because Lori---constantly surveilling Quaid---knew that Quaid participating in Rekall would "pop his memory cap" and reveal that his implanted memories were fakes. Remember that Lori has absolutely no idea why she's handling Quaid or what his purpose is.

So, yeah, while Quaid going rogue and attempting to contact the resistance was Cohagen's (and, I guess, pre-memory screwery Quaid's) plan, Lori had no knowledge of any of this. So she sicked the SWAT team on Rekall. One assumes, to stop the memory implanting procedure before it happens.

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