A drug-robbing Philly cop heads to prison; so does a Houston deputy who helped an Ecstasy dealer, but a lying Oklahoma cop will walk free, and a Texas prison guard is looking at prison for smuggling dope to prisoners. Let's get to it:

In Philadelphia, a former Philadelphia police officer was sentenced August 18 to more than 16 years in federal prison for a plot to steal more than a half-pound of heroin and resell it for cash. Mark Williams, 28, was one of three Philly cops arrested in the case. The other two have already been sentenced. Williams had been found guilty in March of conspiracy to distribute heroin, distribution of heroin, attempted robbery, using a firearm in relation to a violent crime and related offenses. The trio of bad cops went down for a fake traffic stop and bust of a drug courier in which they simply kept the "seized" drugs.

In Houston, a former Harris County sheriff's deputy was sentenced August 18 to five years in federal prison for taking bribes from a drug dealer to provide protection and access to confidential information. George Wesley Ellington, 39, had pleaded guilty in April to extortion under color of official right after a joint investigation by the FBI and the Harris County Sheriff's Office found that he was providing protection and accessing official records for a man he knew was dealing Ecstasy. His wife, Tania Katrisse Ellington, will also serve time for knowingly concealing her husband's illegal activities. She'll do a year and a day.

In Marlow, Oklahoma, a former Marlow police officer pleaded guilty August 19 to charges he lied on the witness stand during a drug trial. He had been indicted on two counts of perjury after prosecutors in the trial stopped the trial because of his falsified testimony. He was set to go on trial Monday, but accepted a plea deal where he copped to one count of perjury and received a three-year suspended sentence and a fine. He also will be unable to work in law enforcement again.

In Huntsville, Texas, a former Texas Department of Corrections guard pleaded guilty Tuesday to charges he was smuggling heroin into a state prison. Alejandro Smith, 21, copped to one count of possessing with the intent to distribute heroin. He went down after "a source" told the FBI he was smuggling dope to prisoners. The FBI set up a sting in which he received from an undercover officer a duffle bag containing heroin. Smith faces up to 40 years in prison when he is sentenced in November.