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Former U.S. attorney on Boston bomber prosecution: 'Speed is not the issue here'

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When he was an assistant U.S. attorney, Tom Heffelfinger worked the case of Earl Karr, a Minneapolis man who planted pipe bombs--23 in all--in Minnesota, Wisconsin and Iowa that injured six people. Now in the wake of the capture of Boston bomber Dzhokhar Tsarnaev, Heffelfinger, who eventually became the U.S. attorney for Minnesota, tells KSTP-TV that slow and steady wins the race.

"There are multiple priorities and they all have to happen at the same time," he tells KSTP." Explosives cases are a challenge because the evidence is destroyed in some respects."

Heffelfinger also tells the station that he agrees with the waiving of Miranda rights in this case, and that the key to prosecution is to understand the motive--something that's elusive so far.

Finally, Heffelfinger tells KSTP that there's no telling how long before charges are filed: "Speed is not the issue here. It's doing it right."

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