Police have given the person who was last seen with her a polygraph test as detectives now admit foul play is likely.
Spierer has not been seen since last week.
Relatives and friends in Westchester County are hoping, praying that Spierer is found safe.
In the meantime, many miles away in Bloomington, the search and the investigation continues working tips.
Investigators are zeroing in on surveillance video from Spierer's apartment building.
That video, according to her father shows a confrontation.
"There was an altercation, it was on tape, but I can't get into the specifics," said Robert Spierer.
But pressed on that Bloomington police would only say; "All of our information including video and interviews indicate that Lauren was not involved in any altercation."
And police would not discuss reports a male friend was involved in a fight with other men earlier.
Hard drives containing the video reveal she came back to her apartment with a male friend at 2:30 Friday morning.
They'd been drinking at a local bar. After the altercation they walked back to the friend's house nearby.
That's the last time she was seen.
Lie detector tests have been given to those who last saw Lauren. No suspects have emerged.
The reward is at $100,000.
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