THC-COOH, Cannabis, Urinalysis Elimination Equation/Algorithm (Single Use)


I think I have it. –> GC/MS Test at 15ng/ml cut-off for THC-COOH metabolite.

1 Joint Equation (explanation below the equation):

130,000,000 (ng in one avg joint)  x .7 x.2 x.3 = 5,460,000ng

5,460,000 / 2,400 (ml of urine in 30 hour period) = 2,275ng/ml

2,275 x .3 x .3 = 252ng/ml (after 60 hours)

252 x .67 x .67 = 112ng/ml (after 120 hours)

112 x .8 x.8 = 71ng/ml (after 180 hours)

71 x .9 = 63ng/ml left in your system – but in that 30 hour period (180-210) you’re only eliminating 8ng/ml each time you pee – so you pass at this point.

The reason the elimination goes from 2/3 to 1/3 to 20% to 10% is because as time moves forward you’re eliminating less from first pass and more from your fat cells.

Explanation of Equation:

1 joint = 1 gram which equals 1,000 milligrams or 1,000,000,000 nanograms.  Today’s Marijuana contains approximately 13% THC on average.  So, a joint would contain 130,000,000 nanograms of THC.  When smoking approximately 30% of the THC is destroyed in a process called pyrolysis (it burns).  So, that leaves you with 91,000,000 nanograms.  Only 20% of the THC is filtered out through the urine, so that leaves you with 18,200,000 nanograms.  Only 30% of the THC in your urine will be the metabolite THC-COOH, so that leaves you with 5,460,000 nanograms in your system.  (Some studies say we should cut the number in half because 50% of the THC is lost in side-stream smoke, but let’s assume you’re a really efficient smoker to be safe.)

Now, we’ll get into the elimination.  I’m breaking our time period down into 30 hour increments.  The average person urinates 2000ml in 24 hours, which makes approximately 2,400ml in 30 hours.  We’re looking for ng/ml so we’ll divide 5,460,000 by 2,400 = 2,275ng/ml.

In the first 30 hours you’ll eliminate 2/3.  You’ll be left with 758 ng/ml, but you’ll eliminate at roughly 1,517 ng/ml throughout the day (2275 minus 758).  The next 30 hours you’ll eliminate 2/3 again. You’ll be left with 252ng/ml and eliminate at 506 ng/ml throughout the 30-60 hour period after smoking.

In the next 60 hours you’ll eliminate at 1/3 every 30 hour period.   So, 252x.67=168ng/ml left in your system, and peeing at 84ng/ml in hours 60-90.  Then, you’ll have 112 and pee at 56ng/ml in hours 90-120.

In the next 60 hours you’ll eliminate 20% per 30 hour period.  So, 112x.8=89ng/ml left in your system, and peeing at 23ng/ml in hours 120-150.  Then, you’ll have 71ng/ml in your system in hours 150-180 at pee at 18 ng/ml.

From then onward you’ll eliminate 10% per 30 hour period.  So, 71x.9=63ng/ml and you’ll eliminate at 8ng/ml.  You should be clear at this point (hour 180 / day 7.5) so long as it was only one gram, it was average marijuana, and it was a single-use.  You can continue on the formula if you want to see when it will be almost completely out of your system…just keep multiplying by .9.

Single Puff:

If you only took one hit then in the beginning of the equation you can divide by 20.  An example of a one hit equation below:

130 million ng / 20 = 6.5 million ng. 6.5million x .7 = 4,550,000 x .3 = 1,365,000 x .2 = 273,000ng.  Divide ngs by 2,400ml = 113ng/ml. Multiply 113 by .3 = 34 (eliminate at 79).  34 times .3 = 10.2 (eliminate at 24 in hours 30-60).  Then 10.2 times .67 = 7ng/ml (eliminate at 3ng/ml in hours 60-90)  You’re in the clear at least by hour 90 with one toke. -Carl Miller

Art vs Science in Army, Painting, and Life


     I’ve reading quite a bit on art and science lately.  It’s become apparent to me that science includes principles and knowledge.  Art is the arrangement of those principles in a creative way, with forethought, to reach the spectacular, novel, and innovative.  It is the ability to play with the arrangement of scientific principles – both using and ignoring them as best fits the end goal.  Most people aren’t artists (and never will be), so they learn the science of a particular subject, and then apply the principles in an imitative way that they’ve seen in the past, or in a manner without forethought toward the spectacular.

     As an example, let’s look at painting.  The student will learn about line, color, shade, form, balance, proportion and scale, contrast, repetition and pattern, unity, and harmony.  He’ll then apply these principles when painting.  But the application of these principles does not make him an artist.  It makes him a scientist of art’s principles.  Over time (Gladwell said 10,000 hours) he may become an artist, but it is not likely.  Most painters will remain scientists in practice.  They may appear to amateurs and other scientists to be artists, but this isn’t the truth.

     As another example, let’s look at the Army.  The officer will learn about the characteristics of the offense, of defense, stability operations, tactics, logistics, anticipation, and decisive points.  He’ll apply these principles in his planning an operation to defeat, destroy, or neutralize an enemy.  He might even win the battle.  But the winning and the application of principles do not make him an artist.  The true artist in war sees the enemy’s move before the enemy sees it.  He recognizes second and third order effects.  He uses the principles of doctrine and ignores them when arranging operations for the greatest success.  As with the scientific painter, the scientific general may appear to his subordinates as an artist, but most of the time he is imitating actions from past battles and copying doctrine.

     I’m not certain if everyone can reach the point of becoming an artist.  I think it requires knowledge and careful study of science.  I think it also involves practicing as a scientist for a long time.  Maybe we become artists gradually over time.  Maybe we’re never complete artists.  Have you ever been so good at something that you are an artist – that you’re 50 moves ahead of everyone else – that you’re as fast as Neo from the Matrix?  I hope to get there some day.  -Carl Miller