abc 7 news community journalist dustin dorsey is live in san jose. how much money are we talking about here? >> reporter: it may be the holiday season but is the time of year for credit card fraudsters. dozens are looking for answers after being hit with hundreds of dollars in unauthorized charges. for some people in south san jose last-minute holiday shopping is on hold because their credit cards were compromised due to hundreds in fake charges. the last charges before the fake charges popped up were made at two unsuspecting locations. >> we shop a lot at the knob hill here and also there's a starbucks there. i saw kind of a common thread between people shopping at those locations. >> reporter: in fact there were double digit complaints from residents who shopped at this nob hill foods and then received calls of fraudulent charges, some in the $400 range made at safeways. >> frustrating because now we'll be delayed about a week and a half until i can get another card to use because my card has been deactivated and i think that happens for most peopl

in san jose, dustin dorsey, abc7 news. >>> well, more to come. you have heard of a breathalyzer to test for alcohol. is there anything similar for cannabis? there. >> actually. local researchers helped make it happen, and now local law enforcement are testing it out. new at 6:00, we'll show you how it works. >>> and get out your phone. go to abc7news.com/vote to answer this question, how does crime affect your day-to-day life? no impact? are you extra cautious? do you go out less? >> vote now and stay with us to hear the story of some bay area residents who went through something that changes how they what does help for heart failure look like? ♪the beat goes on it looks like emily cooking dinner for ten. ♪the beat goes on it looks like jonathan on a date with his wife. ♪la-di-la-di-di entresto is a heart failure medicine that helps your heart, so you can keep on doing what you love. entresto helped people stay athe structure of your heart,.e so it may not work as well. entresto helps improve your heart's ability to pump blood to the body. don't

dustin dorsey has the story. >> reporter: as dozens of south bay residents deal with banks after havingredit cards compromised two arrests have been made in another fraud case. >> i was here shopping yesterday and i was going to get gas and saw this whole place taped off. it's just unfortunate because the holidays are coming and people are looking for ways to get extra money. >> in this case, two men were looking to get extra gas. both men from pittsburgh, california were arrested from san jose police wednesay after store employees noticed the men using fraudulent credit card numbers to purchase a large amount of gas at the safeway gas station. they are they were filling up gas tanks in two trunks and external trunks that totalled $1,700 in gas. that's a lot. now to give you an idea, $3.49 for unled, $1,700 will get you 487 gallons. so, why all that gas? >> that's a lot of gas. what do you need with all that gas? >> only thing i can think of is reselling it. >> i suppose if they have a big tank somewhere they can dump it in a big tank and have gas for a long time. >> the arrests come on