If I'm not mistaken, you posted another question asking whether it was appropriate to seek a 2nd opinion on a case which I answered.
It's impossible to answer this question without knowing what plea bargain offer is, to put it into context of the max penalties, and more importantly what evidence the U.S. Attorney's office has that leads them to think they can still prove you were guilty of conspiracy to import drugs beyond a reasonable doubt even though you say no drugs were discovered.
The Feds can still make a case for conspiracy if, as 1 example, they wiretapped your conversations in which you discussed/planned a drug running operation even though it wasn't sucessful. Whether they had a warrant to wiretap the conversations can be 1 of several things a skilled and experienced criminal defense attorney can exploit if they didn't have a warrant or the warrant was otherwise flawed.
I surmise that you are currently represented by the Federal Defender's in LA, is that right? They're generally very good attorneys and much higher caliber than their counterparts in state courts. Nevertheless, the temptation on their part is to "settle cases" rather than fight to win. My mindset going into EVERY CRIMINAL CASE is to WIN whether by dismissal on a "technicality", acquittal at trial, etc.
I recommend consulting with a criminal defense attorney with experience in handling drug cases (not use or possession of small quantities but drug importation).
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