An email message unearthed in a federal citizen rights probe of Ferguson police in Missouri contained a racist remark against U.S. President Barack Obama, U.S. media quoting an unidentified source reported.

The email between Ferguson police and local court workers said Obama could not possibly stay president because "what black man holds a steady job for four years".

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Another exchange said a New Orleans black woman was taken to hospital to terminate her pregnancy and she got a check two weeks later from the television show "Crime Stoppers."

These email exchanges, together with other evidence, led investigators to conclude that the Ferguson police department did violate the U.S. Constitution with biased law enforcement practices against black Americans, an official privy to the report was quoted as saying.

The complete report is expected to be out this week.

The probe wrapped up with the recommendation that the justice system and the police disproportionately targeted blacks, which triggered a breakdown of trust in the courts and police and to hardly any public safety partnerships.

The federal inquiry was started in September last year, as Ferguson was still grappling with the case of 18-year-old Michael Brown, who was unarmed when he was shot dead by a white law enforcer, Darren Wilson.

The case sparked violent protests. A grand jury decided against charging Wilson with a crime.

Data from the report showed African Americans account for more than 60 percent of the Ferguson population but they belong to 85 percent of citizens who had to go through vehicle checkpoints and 93 percent of arrests.

The report said blacks face twice the possibility of a search as whites but they are less likely to have weapons or drugs in their possession.

The investigation also pointed to data that 14 cases of police dog attacks are linked to blacks while 88 percent of the time Ferguson law enforcement resorted to force was against African Americans.

The report showed a similar trend in the Ferguson courts.

Ferguson municipal judges are 68 percent less likely to dismissed cases against blacks, which also face the bigger possibility of arrest.

From October 2012 to October lat year, 96 percent of those arrested in traffic stops based on one outstanding warrant were black.

Blacks were involved in 92 percent of all disturbing-the-peace charges, 95 percent of jaywalking cases and 94 percent of failure-to-comply charges.