In 2010, Kissorie Allen, a previously convicted sex offender, forced a woman to perform oral sex on him in an apartment building stairwell after the pair met at a bar, according to court records.

The Toronto Police Service botched a sexual assault investigation so badly that the perpetrator was not arrested for five years, when another police force apprehended him for another sexual assault, according to documents obtained by VICE.

The charges against the officers have not been tested at the Toronto disciplinary tribunal, but interviews, police documents, and court records suggest the sexual assault investigation languished for roughly five years.

The charges against the officers are outlined in Toronto police documents released to VICE.

Sgt. Paul Gauthier and Const. Leanne Marchen each face one count of neglect of duty and one count of discreditable conduct while they were working in the force's sex crimes unit—both administrative charges under Ontario's Police Services Act.

As a result, two Toronto police officers face internal disciplinary charges for allegedly failing to act after learning DNA evidence linked Allen to the 2010 assault.

However, Toronto police initially allegedly failed to act on DNA evidence that linked Allen to the 2010 assault. Instead, it wasn't until Peel Regional Police arrested Allen "in 2016 for unrelated sexual offences," that he was arrested for the 2010 incident, according to Toronto police documents.

After assaulting the woman, Allen pursued her as she tried to escape, fighting with her in the building's elevator, then in the lobby. Allen's criminal record, according to a court decision , included a 2009 sexual assault for "[touching] a woman in the crotch area while walking through a GO train station."

"I believe I have a strong defence and I will be fighting these charges," Sgt. Gauthier told VICE in a brief phone interview. Gauthier would not comment in detail on the case. Const. Marchen and her lawyer did not respond to requests for comment.

Questions remain about the crime and why Toronto police did not arrest Allen during the initial investigation.

"The issue was never the DNA; the issue was consent," Owoh said.

Owoh said the Crown presented DNA evidence, dating back to 2011, at Allen's trial for the 2010 assault. The defense did not challenge the DNA evidence.

A Toronto police spokesperson confirmed the original crime under investigation occurred on October 6, 2010, which corresponds to court records for Allen's assault of a woman. Ikenna Michael Owoh, a lawyer for Allen, also confirmed that information. Allen was convicted in March 2017 of the October 2010 assault.

And when Peel Regional Police arrested Allen in 2016 "it was determined that the information originally received in 2011, by [Gauthier], was never acted on."

Because Gauthier "failed to ensure that a thorough and complete investigation was conducted...Allen was not apprehended in a timely fashion," according to a police document.

According to a document outlining a charge against Gauthier, the then-detective "[was] notified [in 2011] that DNA developed from a crime scene sample…corresponded with a convicted offender on the National DNA databank identified as Kissorie Orlando Allen."

The charges against Marchen, who was a detective constable in the Toronto sex crimes unit in 2011, according to a police document, are similar—Marchen is also accused of failing to act on DNA evidence and ensure the arrest of Allen.

They also contain an allegation that Marchen failed to update a police report with her "investigative steps." The documents also state that Marchen learned DNA evidence linked Allen to the crime "on or about August 26, 2011," the same day she is said to have joined the investigation.

Allen's lengthy criminal record includes a conviction earlier this year for sexually assaulting a woman in Brampton on April 30, 2016 as well as past convictions for assault with a weapon, assault, and uttering threats.

Acting Staff Sgt. Joshua Colley said there was no indication that Allen was wanted in connection with the 2010 crime in Toronto when Peel Police arrested him for the April assault.

"At the time of his arrest…back in April 2016, there was nothing on CPIC [Canadian Police Information Centre] advising that he was wanted," Colley said Monday.