Question: Why does Patrick Jane cooperate with the CBI?
About the article "The Mentalist", section "Synopsis".

Candidate passages:
Initially, the murder of Varghese was considered a crime conducted by his business rivals, but five long years of probe by the state police’s crime branch yielded nothing conclusive.
Varghese’s widow then approached the Kerala High Court in September 2007, The Kerala High Court has ordered a CBI investigation in November 2007 into this case.
On investigation, the CBI’s Chennai unit accused 19 people of the murder and said it was possibly due to the long standing feud between the Malankara Orthodox Church which has its headquarters in Kottayam and the Syrian Jacobite Church, which has its headquarters in Ernakulam.
When the CBI arrested Joy Varghese alias "Cement Joy", he confessed that he had hired the criminals who committed the murder for a large sum of money.
Chief Judicial Magistrate, Ernakulam allowed Joy Varghese to be in CBI custody for more investigation.
Murder, scheming murder, and violation of ‘Weapons Prevention Act’ etc.
are the charges against Joy Varghese.
It was severely alleged in recent times that one of the important reasons for suspects not getting arrested due to political interferences.“Some prominent personalities of the Syriac Orthodox Church of Antioch in India were the motive force behind Joy Varghese and there are documents showing withdrawal of Rs.
400,000.00 from their bank accounts”, said CBI.
One clergy man of the said Church is also under severe surveillance of the CBI.
CBI has produced all the seized documents to the High Court in a sealed envelope.
Catholicose of the East Designate Paulose Mar Milithios of the Malankara Orthodox Church expressed his contentment over the CBI actions and hoped for the prevailing of justice in the Malankara Varghese murder case.
The Kerala High Court on June 1, 2010 asked the CBI why Fr Varghese Thekkekkara, the first accused in the Malankara Varghese murder case, was not arrested, if there was evidence against him.
The CBI submitted that Fr Thekkekkara cooperated with the investigation, but the arrest was avoided since it was a sensational case related to the Church.
But the court said this was not a sufficient reason to avoid arrest.
“It is not the first time that a priest is arrayed as an accused.
Does the CBI has a practice of not arresting those who cooperate with the investigation?,” the court asked.
Justice K Hema asked this while considering the anticipatory bail application filed by Fr Thekkekkara, and petition filed by Varghese’ widow Saramma alleging that the CBI was showing discrimination in arresting the accused.
On Jun 11th, 2010, Malankara Orthodox Syrian Church Managing Committee endorsed a motion, which "appeals to the authorities to bring all culprits into day light and to judicial trial, who are behind the brutal murder of Malankara Varghese, former Malankara Managing Committee Member".
On Jun 16, 2010 Father Varghese Thekkekara surrendered before the Chief Judicial Magistrate in Ernakulam.
The magistrate M N K Leelamani granted bail to him on furnishing a bond of Rs 25,000 plus two sureties for the like amount.
On February 25, 2011 The Chief Judicial Magistrate Court, Ernakulam, directed the Central Bureau of Investigation (CBI) to reinvestigate the murder of Malankara Varghese, on a petition filed by his wife, Saramma Varghese.
She alleged that the charge sheet submitted by the CBI did not have the names of ‘higher ups' involved in the conspiracy to kill her husband.
On Oct 21, 2011 The CBI unit, Thiruvananthapuram quizzed Jacobite Syrian Church Catholicos Baselios Thomas I in connection with the murder case.
The Catholicos appeared before the CBI at its office in Kochi.
According to CBI sources, he was quizzed by the officials for three hours. 
In the season 4's finale "The Crimson Hat", after being fired from the CBI, Jane finds himself in a Las Vegas bar, where he meets an attractive woman named Lorelei (Emmanuelle Chriqui).
He proceeds to get arrested.
Lorelei bails him out, and the two eventually make love in Jane's apartment.
The next day, however, Lorelei reveals herself as an associate of Red John, and says her presence in Jane's life is "a gift".
She brings forward Red John's proposal for friendship and a 'change' in Jane's lifestyle to help him overcome his depression.
Jane is genuinely shocked and tells Lorelei to get out.
However, he later confides to Lisbon that his breakdown had been tailored to get Red John to believe Patrick was really giving up.
Red John communicates through Lorelei that he will only meet Jane in person if he kills Lisbon and brings him her head as a "present".
The CBI team executes a plot where they fake the murders of Lisbon and Rigsby at the hands of Jane, and the team goes into hiding.
On hearing this over the news, Red John sends a message across to Jane to meet him in Nevada.
Darcy is investigating the apparent deaths of Lisbon and Rigsby.
She discovers that the body found does not belong to Rigsby and gets immediate arrest warrants issued against the entire team involved in the deception.
Meanwhile, a limousine pulls over in the middle of a deserted street where Jane is waiting.
Lorelei and a huge, armed man emerge from the car, and she claims Red John is inside.
Lorelei looks at the box Jane is bearing and wryly asks if it contains a football or a cabbage.
He tells her it is a melon, specifically a honeydew.
She does not react angrily, apparently since Red John (and thus she) became aware of Jane's deception.
Lorelei does have her enormous, powerfully built assistant beat Jane up "a little".
Jane sits in the front seat of the limo while a dark shadowy figure sitting in the back whose voice is distorted with a radio transmitter, and whose face is not visible, greets Jane.
He tells Jane that he was fooled for a while by Jane's plot but was apprised of the truth by a "good friend" inside the FBI.
At this moment Lisbon and her team, who were to move in and arrest Red John, are arrested by Darcy and her squad.
Lisbon, cuffed on the side of the road, frantically tells Darcy about the plan and the imminent danger to Jane's life.
Just as Lorelei is about to reluctantly punish Jane by cutting off two of his fingers, the CBI and FBI teams arrive.
Jane emerges unharmed.
The FBI fire bullets at the fleeing limousine, which comes to a stop.
Lorelei is arrested unhurt, although the driver/bodyguard is killed.
Darcy opens the back door, which reveals CBI Director Luther Wainwright, bound and dead, with a cell phone attached to his body.
Lorelei is interrogated at the CBI by Jane and Lisbon.
She refuses to speak about Red John but tells Lisbon that she and Jane have been lovers, calling Jane "lover" frequently.
Jane tells Lorelei with certainty that she will eventually reveal what she knows and walks out of the room, ending season 4. 
Appearance and personality.
Personal style.
Jane characteristically wears a three piece suit with no tie (though in flashback episodes, pre-CBI, he does wear the tie), and the same brown, leather shoes.
His wearing of the suit with vest has been explained by the show's creator, Bruno Heller, as follows:Jane wears the same brown, scuffed leather shoes in each episode, and in the episode "Not One Red Cent" in season 5, he finally has them re-soled.
Jane drives a pristine condition Citroën DS 21 Pallas.
Midway through season 6, and after the death of Red John, Jane's appearance changes and he no longer wears his characteristic vests, though he continues to wear battered suits and his scruffy shoes. 
The Mentalist is an American police procedural television series that debuted on September 23, 2008, on CBS.
The show was created by Bruno Heller, who is also its executive producer.
The show follows former "psychic" Patrick Jane (Simon Baker), who is a consultant to the California Bureau of Investigation (CBI) (and beginning with season six, the FBI), using the highly developed observational skills he previously employed to "read" people's minds. 
The series follows Patrick Jane, an independent consultant for the California Bureau of Investigation (CBI) based in Sacramento, California.
Although not an officer of the law, he uses skills from his former career as a successful yet admittedly fraudulent psychic medium to help a team of CBI agents solve murders.
The ultimate goal of Patrick Jane in his cooperation with the CBI is to track down the killer known as "Red John," who was responsible for the brutal murders of his wife and daughter.
Jane formerly had a lucrative career as a con man, successfully posing as a psychic medium and enjoying near-celebrity status.
Five years before the events in the show's pilot episode, he appeared on television to claim that his paranormal abilities helped the police profile a serial killer named Red John.
Red John, angered by the perceived slight, murdered Jane's wife and young daughter in revenge.
Jane subsequently abandoned his job as a psychic and teamed with the CBI, using his skills to help them solve various crimes.
His main focus is on the cases involving Red John or Red John copycats.
He admits to faking the supernatural aspects of his skills, often asserting that "there's no such thing as psychics," yet he has finely honed skills in cold reading, hypnosis, and pickpocketing, as well as powerful observational skill and a deep insight into the human psyche and behavior.
His last act at CBI was to finally find Red John and kill him.
After spending two years off the grid, Jane cut a deal with the FBI to work for them, bringing with him former CBI Senior Agent Teresa Lisbon, the only person who seems to be able to keep Jane's theatrics and lack of boundaries under control.
Jane and Lisbon work with their former fellow CBI agent Kimball Cho, FBI Agent Kim Fischer, are supervised by the no-nonsense Agent Dennis Abbott and are now based in Austin, Texas.
The rest of the former CBI team, Wayne Rigsby and Grace Van Pelt, have started their own security firm, but keep in touch with their former colleagues.