They are not searching caves, but are evaluating materials seized from the caves.
Mr. Azad was released without being charged, pending further investigation, and had computers and other material seized from his home.
The Orlando police said Thursday that the print was either unclaimed stolen property or material seized in a drug raid.
The materials seized there included syringes and items used for blood-doping.
But the officials said that Washington was still awaiting scientific confirmation that the material seized was weapons-grade.
All materials seized from O'Neill were ordered returned.
The material seized included racing forms and evidence that he used the office to buy and sell thoroughbreds.
In the past, the material seized in such cases has been of poor or useless quality, in terms of producing a nuclear bomb.
When she learned of the tapes, Ms. Reno ordered the material seized for safe-keeping.
That was something the President wanted stopped at all costs, the buyers and sellers neutralized, any nukes or material seized or destroyed.