Frequently Asked Questions

Where do I Drop off Samples?  
  • We are conveniently located in sunny southern California at: 
  • 15375 Barranca Parkway Suite F106 Irvine, CA 92618 


I’m interested in partnering with QTL, how do I get started? 

  • Quality Testing Lab is now proudly serving the OC, Los Angeles and IE Cannabis Communities for all their R&D testing needs! 
  • To get started, email or call us directly at 949-398-6647 


What does R&D testing entail? 

  • R&D Tests are... 
  • Limited to internal use for manufacturers, distributors, brands etc. to improve their products/processes 
  • Not submitted to the State of California 
  • Utilize a smaller sample-size 
  • Includes the same tests used for regulatory compliance testing, but can be purchased individually 

How much sample do I need to give to you for testing?


Suggested Amount (g) 





Heavy Metals 




Residual Solvents 






Water Activity 


Moisture Content 



How much does R&D Testing with QTL cost?       

  • Please contact us at or (949) 398-6647 for a price list. We are currently offering 10% off lab services for new clients! 


Can I drop off my samples in person? 

  • Yes! You can drop off R&D samples at our laboratory. We are located at: 
  • 15375 Barranca Parkway Suite F106 Irvine, CA 92618 


  • We are taking every precaution to keep our lab staff and clients safe from COVID-19  


Can I mail my samples? 

  • Currently, we are not accepting mailed samples. 


I would love to tour your facility, is that possible? 

  • Yes, we would love to have you in! 
  • Contact to arrange a tour 
  • At this time, we are requiring all visitors who enter the facility to please wear proper face coverings, and to maintain social distancing. We do also ask that if you have traveled, been in contact with someone who may have COVID or are experiencing any symptoms, to please reschedule their assigned tour date. We are doing our best to help stop the spread of COVID-19 by maintaining the highest standards of cleanliness, requiring all employees to regularly wash their hands and disinfect the facility. 


What are your hours? 

  • Quality Testing Lab is open 9:00am-4:30pm Monday-Friday 


Are you ISO certified? 

Where can I learn more about California Cannabis testing and regulations?  


For any other questions, please email us at or call (949) 398-6647