Washington ( CNN ) -- Panicked as the FBI closed in Friday morning , Prince Georges County Executive Jack Johnson and his wife Leslie raced to find a $ 100,000 check for an alleged kickback and flush it down the toilet . With agents knocking at the door , Leslie Johnson stuffed nearly $ 80,000 in her bra . The dramatic end to an alleged years-long kickback scheme is outlined in detail in an affidavit written by FBI investigator Wendy Munoz , whose team was monitoring wiretaps . Johnson , who has served as the executive of Prince Georges County since 2002 , was taken into custody along with his wife . The Johnsons made a first appearance in federal court late Friday in Greenbelt , Maryland , just outside Washington . They were both charged with tampering with evidence and destruction of records . U.S. Attorney Rod Rosenstein stressed the investigation is continuing . The Johnsons were released on their own recognizance , but Jack Johnson will be required to wear a monitoring device . He presumably will be allowed to continue serving out the last weeks of his expiring term as county executive if he chooses . The judge , however , ordered him not to attempt to destroy any evidence . Jack Johnson had been the Prince Georges County prosecutor prior to his eight years as executive . Leslie Johnson was just recently elected to the nine-member Prince Georges County Council . The ten-page affidavit says the FBI began investigating Johnson in 2006 when it learned that certain real estate developers were paying Johnson for contracts . That led to a `` a series of authorizations for the interception of wire communications . '' The frantic end began early Friday when Johnson allegedly received a $ 15,000 payoff , and the FBI suddenly barged into the room to demand an explanation . Johnson told them the cash was for a party marking the end of his tenure as county executive . He also claimed he had no dealings with the developer who was with him . The FBI says Johnson made a series of false statements . The agents let him go but then eavesdropped on a series of frantic phone calls between Jack and Leslie Johnson as Jack Johnson and the FBI headed for the Johnsons ' Mitchellville , Maryland , home . `` Two women ( agents ) are at the door , '' Leslie told her husband . `` Do n't answer it , '' Jack said . He told her to run upstairs to their bedroom and go to `` my drawer . '' `` You will see a check in there that [ an unidentified developer ] wrote to me , '' he said . The affidavit says when Leslie found the check Jack told her to tear it up . `` Do you want me to put it down the toilet ? '' she asked . Jack Johnson replied , `` Yes , flush that . '' The agents monitoring the phone calls heard a flushing sound . Leslie Johnson grabbed cash from the bedroom and also ran to the basement and grabbed more cash . `` Put in your bra and walk out or something , I do n't know what to do , Jack said . `` I have it in my bra , '' his wife replied . `` FBI agents then searched the person of Leslie Johnson incident to her arrest and recovered $ 79,600 in U.S. currency from her underwear , '' the affidavit says . The wild ending may end up costing the Johnsons . The FBI says there is probable cause to believe that the pair `` tampered with ... evidence and engaged in destruction , alteration , and falsification of records in a federal investigation . '' The FBI document does not say how much money Johnson may have received in kickbacks or bribes . It does say at least some of the funds involved were targeted from an $ 80 million dollar budget to programs supported by federal grants such as those from Department of Housing and Community Development .
NEW : Agents are charged with tampering with evidence and destruction of property . NEW : Agents hear Jack Johnson tell his wife to ` ` flush '' a check . Federal agents execute search warrants as part of an ongoing investigation . Affidavit : Karen Johnson hides $ 80,000 in her bra as FBI agents knock at the door .