About Redwood Toxicology Section

Drug Test Resources

Essential resources for your drug test program.

Redwood Toxicology Laboratory's (RTL) Resource Library includes comprehensive information to help our clients understand all aspects of drug testing.

Do you have questions about specimen collection and chain of custody? Do you need more information on drug interactions and street names? The general drug information, listed below, can answer some of these questions.


Account Management Forms

Convenient account management forms for re-ordering drug testing supplies, reordering a test, and requesting updates to your account information.

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Frequent Questions

The information found on this webpage can help answer many common questions, and assist you in managing a substance abuse testing program.

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Lab Cutoffs/Methods

Accurate & reliable drug testing —The following is an explanation of RTL's screening and confirmation procedures/cutoff levels.

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Specimen Collection

The manner in which specimens are collected and handled is very important. Specimens must be handled and controlled by collection site personnel throughout the collection process.

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Labeling & Shipping

The following is a guide on how to properly label and package specimens being sent to RTL for screening & confirmation testing.

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Result Reporting and Collection Management

RTL's objective is to provide its clients with all the tools possible to help prevent drug abuse. Reliable and useful toxicology reports are essential to this objective.

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Device Resources

RTL's objective is to provide its clients with all the tools possible to help deter and prevent drug abuse. Reliable and useful on-site screening device resources are essential to this objective.

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Collection Network

If you are a collection site or TPA agency and wish to work directly with Redwood Toxicology Laboratory, please join our referral network.

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Drug Information

This information will assist you in understanding specific drugs of abuse and how Redwood Toxicology Laboratory's wide range of urine and oral fluid screening programs test for each drug.

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Useful Links

The following links provide comprehensive information on drugs, drug and alcohol abuse, drug abuse prevention, drug testing, recovery programs and general health related sites.

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The Resource Library includes information available in our printed Reference Guide, delivered to all new clients. To download a PDF of our Reference Guide, click here.

What customers say

“RTL has provided excellent drug detection services over the past nine years. Your support staff is always available by phone and respond promptly to any information we need. We receive regular shipments of supplies and appreciate the seamless chain-of-custody from our collection site to your test facility.”—Chemical Dependency Counselor