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About us

About Us

Our Philosophy:

Canyon Diagnostic was created by a social worker (Joss Williams) and a psychiatrist (Paul R. Puri), to raise the bar in the substance abuse/recovery world.

They realized that a key piece to helping people maintain sobriety is having quality information. That means accurate diagnoses, and the true status of sobriety. Too often people operate under incomplete information — treatment providers don’t know a client’s true diagnosis, or whether someone is using drugs that a typical drug test might not reveal. They created a company that could do both, yet with a compassionate, person-centered approach. 


Joss Williams, LCSW


Founder and CEO

Joss Williams, LCSW, received both his B.A. and Masters in Social Work from New York University (NYU).  He began working in psychiatry at UCLA Medical Center in 2007.  Among his patients were many with substance abuse problems, and Joss became increasingly involved with drug treatment and recovery programs outside UCLA.  He developed a specific interest in drug testing not as a punitive measure but as a tool for creating accountability and engagement to help people maintain sobriety.

His work at UCLA included being nominated to the UCLA LEAN Academy, where he developed an aftercare model that helped clients maintain treatment gains after discharge.

Joss founded Canyon Diagnostic in 2015 and partnered with Paul Puri.  In his free time he can be found with his wife and three sons in the canyon where they live.


Paul R. Puri, MD


President and Medical Director

Dr. Paul Puri is a board-certified psychiatrist in private practice in Los Angeles. His training and work experiences have included inpatient rehab, inpatient detox, and outpatient treatment centers. He has worked with groups ranging from the homeless to veterans to the affluent, even in concierge medicine. His philosophy is that more information is the key to making informed decisions, whether for an individual, a family member, or a treatment provider.

In his private practice, Dr. Puri specializes in the use of multiple forms of psychotherapy in addition to medications. He attended medical school at University of Rochester, and specialty training in psychiatry at UC San Diego. He is currently a clinical Assistant Professor at UCLA.


Jennie Williams, LCSW


Chief Operating Officer

Jennie graduated from NYU in 2001 with dual Masters degrees in Social Work and Public Administration. After the terrorist attacks of 9/11, she worked at a High School in Manhattan with adolescents and their families who experienced trauma. 

In 2006, tired of the NYC grind, Jennie moved back to her native Los Angeles and worked at UCLA’s Rape Treatment Center. She has 14 years experience working in therapeutic settings and in the human services field. She has extensive experience in treating adolescents and young adults with both mental health and substance abuse issues. Jennie’s areas of specialty are trauma treatment, anxiety and depression, substance abuse, family therapy, grief, and adolescent behavioral issues.

Jennie uses her relaxed, authentic and non-judgmental approach to form meaningful relationships with her clients. She sees addiction as secondary to an underlying issue, but recognizes the benefit of involvement in the recovery process.

Contact Us

Canyon staff can be reached by email at info@canyondiagnostic.com 
For customers, alternative contact info will be provided when signing up for services.
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  • ALCOHOL
  • Ethyl Glucuronide (alcohol metabolite)
  • OPIOIDS/ PAIN MEDICATIONS
  • Codeine
  • Morphine
  • Hydrocodone
  • Hydromorphone
  • Noroxycodone
  • Norhydrocodone
  • Buprenorphine
  • Norbuprenorphine
  • Fentanyl
  • Norfentanyl
  • Meperidine (Demerol)
  • Normeperidine
  • Oxymorphone
  • Naloxone
  • Tramadol
  • O-desmethyl-tramadol
  • Methadone
  • EDDP (methadone metabolite)
  • Tapentadol
  • 6-MAM (heroin metabolite)
  • Propoxyphene
  • SEDATIVES/ BENZODIAZEPINES/
    HYPNOTICS/ DISSOCIATIVES
  • Diazepam
  • Nordiazepam
  • Temazepam
  • Clonazepam
  • Oxazepam
  • Lorazepam
  • Alprazolam
  • Alpha-hydroxyalprazolam
  • 7-aminoclonazepam
  • Hydroxyethylflurazepam
  • Alpha-hydroxymidazolam
  • Alpha-hydroxytriazolam
  • Amobarbital
  • butabarbital
  • butalbital
  • pentobarbital
  • phenobarbital
  • secobarbital
  • Meprobamate
  • Zaleplon
  • Zolpidem
  • Zopiclone/Eszopiclone
  • Dextromethorphan
  • Ketamine
  • MDA/ MDEA/ MDMA
  • Phencyclidine
  • STIMULANTS/ COCAINE/ ETC
  • Amphetamine
  • Methamphetamine
  • Ritalinic Acid
  • Atomoxetine
  • Benzoylecgogine (cocaine metabolite)
  • Cocaethylene (cocaine metabolite)
  • Ecgonine methyl ester (Crack cocaine)
  • Cathionine
  • Phentermine
  • OTHER ILLICIT DRUGS/ SYNTHETICS
  • Salvinorin A
  • Cannabinoids
  • Spice/K2 - JWH 018, JWH 210, JWH 122, JWH 250, JWH 073
  • Mitragynine (Kratom)
  • Alpha-PVP (Flakka)
  • Desomorphine (Krokodil)
  • Psilocin
  • 25I-NBOMe
  • PRESCRIPTION MEDICATIONS
  • Chlorpheniramine
  • benztropine
  • bupropion
  • buspirone
  • carbamazepine
  • clonidine
  • cyclobenzaprine
  • gabapentin
  • lamotrigine
  • pregabalin
  • topiramate
  • valproic acid
  • aripiprazole
  • asenapine
  • clozapine
  • haloperidol
  • lurasidone
  • olanzapine
  • quetiapine
  • risperidone
  • 6-OH-risperidone (paliperidone)
  • ziprasidone
  • Desmethyl Cyclobenzaprine (cyclobenzaprine metabolite)