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(TMZ) - The L.A. County D.A. will CLEAR Cee Lo Green of charges he sexually assaulted a woman by allegedly slipping a drug in her drink ... TMZ has learned.  Cee Lo will, however, be charged with the felony of furnishing ecstasy ... law enforcement sources tell TMZ.

Sources tell TMZ the D.A. will officially REJECT the sexual assault case this morning.  A woman had claimed she and Cee Lo went to a sushi joint in downtown L.A. more than a year ago.  She told cops the star of "The Voice" had slipped ecstasy in her drink and the next thing she knew she was naked in his bed.

Law enforcement sources tell TMZ, authorities had problems with the woman's story ... one of which was that she and Cee Lo had been dating for months and had already been intimate.

TMZ reports Cee Lo not only denied the allegations ... he encouraged the D.A. and the LAPD to fully investigate.  In the end, TMZ reports, the D.A. will reject the sexual assault case because of insufficient evidence.

As for the drug charge ... law enforcement sources tell TMZ Cee Lo will be charged with 1 count of furnishing ecstasy ... a felony, and he may be arraigned as early as this afternoon.

As TMZ previously reported, the woman claimed to have a tape recording of Cee Lo talking about the incident.  Although sources tell TMZ CeeLo never said anything about slipping ecstasy in her drink, he did reference the drug.  It appears the D.A. views the tape as a confession to drug use ... thus the charge.

TMZ reports the criminal complaint will NOT allege the singer had any criminal intent to harm the woman when he allegedly shared ecstasy with her.  

As for punishment ... TMZ reports most people with such a first offense get probation. 

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