AND GIVES HIS SIDE OF THE STORY, COMING UP. ? Ruth: WE HAVE A NEW WARNING ABOUT KIDS GETTING INTO YOUR MEDICATION AND BEING POISONED. AND WE'RE TALKING ABOUT COMMON MEDICATIONS IN MOST HOMES WHICH HAVE CHILD SAFETY CAPS. THE CAPS ARE MEANT TO KEEP THEM SAFE, YOU HAVE TO PUSH DOWN AND TWIST. EVEN FOR PRE-SCHOOLERS, OPENING A BOTTLE LIKE THIS ONE CAN BE CHILD'S PLAY. Reporter: THIS 4-YEAR-OLD JUST OPENED A BOTTLE OF COUGH SYRUP. I DID IT! Reporter: POTENTIALLY LETHAL. THIS BOY JUST GOT INTO POWERFUL PAINKILLERS. HOW DID THEY DO THAT? ALL OF THEM ARE SEALED WITH CHILD SAFETY CAPS. THAT'S SCARY FOR A LOT OF PARENTS. IT SHOULD BE. WHATEVER THEY GOT HERE COULD KILL YOUR CHILD. Reporter: KAY CARR IS WITH SAFE KIDS AND SAYS THE CAPS MAY BE PART OF A BIGGER PROBLEM. THIS NEW REPORT SHOWS A STUNNING 30% SPIKE OVER THE PAST DECADE IN YOUNG KIDS ACCIDENTALLY POISONED BY MEDICATION. 67,000 CHILDREN RUSHED TO HOSPITAL ERs IN 2011 ALONE. THIS IS ENTICING TO A CHILD. THEY THINK IT'S GREAT, LIKE CANDY, SO THEY'LL SWALLOW IT AND GO AFTER MORE. Reporter: YOU'RE ABOUT TO SEE HOW FAST IT CAN HAPPEN. WE INVITED THIS GROUP OF 4-YEAR-OLDS TO A PLAY DATE. THEN WE BOUGHT SEVERAL MEDICATIONS, FROM IBUPROFEN TO ACETAMINOPHEN, COUGH SYRUP AND PRESCRIPTION ANTIBIOTICS AND TOXIC DRAIN AND FLOOR CLEANERS. ALL CAN BE POISONOUS AND EVEN DEADLY AND COME WITH CHILD RESISTANT SAFETY CAPS. WE DUMPED EVERYTHING OUT. WE EVEN CLEANED AND SANITIZED THE BOTTLES, SO NOTHING WAS LEFT BEHIND. BACK AT THE PLAY DATE WITH THEIR PARENTS LOOKING ON, WE GET STARTED. WE WANNA SEE HOW QUICKLY YOU CAN OPEN THESE BOTTLES. ONE, TWO, THREE... GO! WITHIN THREE SECONDS, WATCH. FRANCESCA POPS THE SAFETY CAP ON IBUPROFEN. ACCORDING TO SAFE KIDS, THE NUMBER ONE DRUG KIDS GET INTO. ABOUT A MINUTE LATER, SHE OPENS ANOTHER BOTTLE OF ACETAMINOPHEN, NUMBER THREE ON THE LIST. YOU OPEN THAT ONE, TOO. YES. Reporter: MARK OPENS THE COUGH SYRUP. AND THE DANGEROUS PAINKILLERS. REMEMBER, THIS COULD BE POISON FOR A CHILD. YET THERE'S BRAIDEN OPENING BOTTLES, NO PROBLEM AT ALL. EVERY SINGLE CHILD IN OUR GROUP OPENED AT LEAST ONE. OLIVIA OPENED TWO WITHIN MINUTES. HOW DID YOU OPEN THAT? I DID IT BY MYSELF. REALLY FAST. I DID IT REALLY FAST BECAUSE I'M A BIG GIRL. Reporter: HER MOM WATCHED IN HORROR. YOU BUY THEM EXPECTING THEM TO BE CHILD PROOF. AND MY 4-YEAR-OLD SAT THERE AND OPENED IT, VERY EASILY. Reporter: WHAT YOU MAY NOT KNOW, UNDER FEDERAL LAW, THE CAPS DON'T HAVE TO BE CHILD PROOF, JUST CHILD RESISTANT. ARE THE REGULATIONS TIGHT ENOUGH? I THINK THEY ARE. WE DON'T WANT TO MAKE IT IMPOSSIBLE. WE WANT TO MAKE SURE KIDS CAN'T GET TO MEDICINE. Reporter: IT COMES DOWN TO US AS ADULTS. WE LEAVE IT IN OUR BAGS, ON COUNTERS, AS A REMINDER TO TAKE THEM BUT CAN MAKE THEM ACCESSIBLE TO SMALL KIDS. FOR FRANCESCA'S DAD, IT WAS A WAKE-UP CALL. I HAVE TO CHECK THE HOUSE AND MAKE SURE THEY'RE PUT AWAY, BEING THEY'RE THAT EASILY OPENED BY A 4-YEAR-OLD. IT WAS EASY! Ruth: AND IT'S UNREALISTIC TO LOCK UP OUR MEDICATION. SO THE EASIEST THING TO DO IS TAKE IT OFF THE NIGHTSTAND AND PUT IT UP AND AWAY WHERE YOU CAN REACH IT BUT YOUR CHILD CANNOT. AND AT THE END OF THEIR PLAY DATE, THE CHILDREN IN THE STORY WERE TOLD IT WAS A TEST AND THAT THEY SHOULD NOT TRY TO OPEN ANY OF THE BOTTLES AT HOME. CHILD RESISTANT, NOT CHILD-PROOF. Devin: AND EVEN ADULTS HAVE TROUBLE OPENING THESE AND THEY