Definition: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: Prosecutor drops DUI charge on man who tested positive only for caffeine 
  
 He was arrested and charged with driving under the influence in Solano County, but investigators found no alcohol or drugs in his system. 
  
 Fairfield resident Joseph Schwab, 36 did test positive for one substance: caffeine. 
  
 Prosecutors kept his DUI charge intact for more than a year after his arrest, insisting he had to have been under the influence of some other drug that didn’t show up in the test, based on a police officer who said he weaved in and out of traffic and almost caused several collisions. Police also said he failed sobriety tests at the scene. 
  
 The Solano County District Attorney’s Office dropped the DUI charge against Schwab Wednesday, some 16 months after he was pulled over on Interstate 680 driving north in August 2015. 
  
 “Without a confirmatory test of the specific drug in the defendant’s system that impaired his ability to drive, we do not believe we can prove the charge beyond a reasonable doubt,” said Krishna Abrams, the district attorney, in a written statement. 
  
 Abrams insisted the case was “never about caffeine,” and she insisted that Schwab had to have been under the influence of another drug that didn’t show up in the test. Not all drugs do under standard rounds of testing. 
  
 Photo: Avid_creative / Getty Images Image 1 of / 1 Caption Close Image 1 of 1 Fairfield resident Joseph Schwab was pulled over and charged with a DUI, despite only testing positive for caffeine. The district attorney later decided to drop the charge. Fairfield resident Joseph Schwab was pulled over and charged with a DUI, despite only testing positive for caffeine. The district attorney later decided to drop the charge. Photo: Avid_creative / Getty Images Prosecutor drops DUI charge on man who tested positive only for caffeine 1 / 1 Back to Gallery 
  
 Police said they found a slew of workout powders inside Schwab’s car, but all were legal. 
  
 Prosecutors haven’t dropped a second charge of reckless driving, a misdemeanor, against Schwab, for which he’ll proceed to trial Jan. 11. 
  
 Michael Bodley is a San Francisco Chronicle staff writer. Email: mbodley@sfchronicle.com. Twitter: @michael_bodley ||||| A California DA has dropped charges against a man who was slapped with a DUI even though a drug test at the time only came back positive for caffeine. 
  
 Yes, a DUI for being caffeinated. There is definitely more to this story. 
  
 Pulled over for erratic driving, then charged 
  
 Joseph Schwab was pulled over in August 2015 in Fairfield, California. According to a statement from the Solano County District Attorney’s office, the officer at the scene was suspicious because of Schwab’s “erratic and reckless driving” and his “demeanor” and “performance on a number of field sobriety tests.” 
  
 The officer charged Schwab with a DUI, and the charge stood even when his blood sample tested negative for drugs such as cocaine, THC and opiates. 
  
 How can you hang a DUI on caffeine? 
  
 The reason, according to the District Attorney’s office, was because drug tests don’t catch all drugs, and based on the officer’s account it seemed like Schwab was definitely on something. 
  
 This reasoning didn’t fly with Schwab’s attorney, who told CNN affiliate KCRA she couldn’t believe the charge. 
  
 “I actually consulted with the other attorneys in my office to make sure that I wasn’t missing something.” 
  
 Charges dismissed 
  
 On Wednesday, the DA’s office announced they were filing a motion to dismiss the charges. That doesn’t, however, mean they don’t think drugs were in play. 
  
 The DA’s office said forensic lab experts claim it was “highly likely the defendant was under the influence of a drug,” but since they have no way to prove it beyond reasonable doubt, Schwab’s off the hook. |||||
Output:
He was busted for driving while intoxicated, and now, 16 months later, Joseph Schwab has had his DUI charge dropped. The California man had been pulled over in Solano County in August 2015 after it was reported he was driving erratically, and he was arrested for DUI, although later tests found he had no alcohol or drugs other than caffeine in his system. The DUI charge was kept on the books, however, because prosecutors contended his driving was so all over the place that he had to have had another drug in his system that wasn't showing up in tests, per the San Francisco Chronicle. Schwab was also said to have failed sobriety tests at the scene. The Solano County DA's office conceded this week, noting in a written statement that it was finally giving up and dropping the DUI charge because it didn't think it could prove it beyond a reasonable doubt, though it still maintains it's "highly likely the defendant was under the influence of a drug," per KTLA. A misdemeanor charge against Schwab for reckless driving remains. (A man in Japan drank himself to death with caffeine.)