Eighteen years ago,
I sent the FBI Crime Lab samples...
The Big Bang Theory Season 4, Episode 7
--EIGHTEEN, 19 and 20.
Breaking Bad Season 5, Episode 11
If you would just let me.
Eighteen months.
Breaking Bad Season 2, Episode 12
Eighteen parts per million.
The Big Bang Theory Season 8, Episode 9
Eighteen kilometers per hour.
Money Heist Season 3, Episode 8