The obituary in the York Weekly was heartbreaking. Just 17, Bethany Fritz was a high school senior hoping to study art at the University of Maine. She lived in an affluent coastal community of tidal pools, winding roads and thick stands of maple and oak. She loved her family and friends, her two cats and her dog, Farleigh. Unmentioned was her cause of death: an overdose of heroin. 'We were completely flabbergasted that someone could get heroin here,' said Sarah Lachance, one of Bethany's older sisters. 'We thought heroin was something only junkies in the city did.' New England may be thousands of miles from the producers and brutal drug enterprises of Mexico and Colombia. But a busy pipeline from Mexico resolutely moves heroin and cocaine to emerging markets as far away as coastal Maine, where more and more addicts fill courtrooms, jail cells, treatment facilities and morgues. 'It's just unbelievable what we've seen here,' said Edward Strong, police chief in nearby Kittery. 'I can remember when people around here didn't know what the word `heroin' meant. Now, it's everywhere -- cheaper, more available, and demand is high.' When Fritz died in 2004, York's small police department did not have a full-time narcotics investigator. Tom Cryan, the detective assigned to the case, admitted, 'I wasn't getting anywhere.' Then he got an offer of help from Steve Hamel, the full-time narcotics detective in Kittery, another tiny coastal community one exit south on Interstate 95. Hamel already was working closely with a narcotics officer in the next town down the coast, Portsmouth, N.H. Detectives from the three departments banded together to trace the source of the heroin and, eventually, helped send Bethany's boyfriend and his supplier to prison. Now, the detectives have created an unofficial partnership, impishly dubbing themselves the Seacoast Narcotics Interdiction Force, or SNIF. Although their home cities have a combined population of only 40,000, they've shut down several local heroin and cocaine rings and racked up dozens of arrests in three states. But, Hamel said, 'you could have 30 guys at every police department doing drug enforcement and you still couldn't keep up.' Most days, southern Maine's pre-eminent narcotics officer looks like a suburban father on his way to the hardware store: blue jeans, work boots and a New England Patriots cap shading a sunburned face. The son of a New Hampshire state trooper, Steve Hamel has spent most of his 21-year career working undercover, investigating biker gangs and drugs. At 47, he actually is a suburban father who coaches and referees high school and college basketball and runs a landscaping business on the side. Hamel's counterpart across the Pascataqua River in New Hampshire is Stephen Arnold, a stocky 45-year-old father of four with a round, bearded face, a thick brogue and a fondness for baseball hats and Marlboro Lights. Rounding out SNIF are two detectives from York, the Beverly Hills of the coastal burgs. Cryan, 44, father of a teenage boy, has been investigating crimes in York for two decades. His colleague Mark Clifford, 40, is a former golf pro who came out of a patrolman's uniform several years ago as York's first full-time narcotics detective. The members of SNIF answer to their own chiefs, but they function as an independent unit on the ground. Keeping in contact by cell phone, text message and two-way radio, they share information and informants and take turns making undercover buys and running surveillance. They also work with the U.S. Drug Enforcement Agency and follow cases where they lead, roaming three states and towns as far south as Lawrence, Mass., the source for most of the narcotics in New Hampshire and Maine. In Lawrence, the drug trade is run by Dominican dealers with ties to Mexican cartels. SNIF's efforts have resulted in tens of thousands of dollars in confiscated homes, cars and cash, which is divvied up among the departments to help fund drug enforcement efforts. Along the way, Hamel and Arnold have been teaching their York colleagues the dangerous art of undercover drug work. 'No one teaches you to be a street narc in the academy,' Hamel said. 'And most guys look at the work and say, `Not for me, dude.' ' As they waited for an informant to arrange an undercover buy recently, the veterans teased Clifford about a York heroin addict he had turned into an informant a few months earlier -- an informant who was robbing banks to feed his habit even as he helped the police. Both York detectives have picked up valuable lessons along the way, including the importance of a plausible cover identity. 'If you're 130 pounds soaking wet and have smooth hands, like Cliff here, you can't pretend to be a bricklayer,' Hamel said. 'You have to look the part.' One reason the overdose death of Bethany Fritz was such a shock was the setting: York is a family resort town with a rich, 350-year-old history, located just more than an hour's drive north of Boston. 'It really opened our eyes,' Cryan said, 'and made us realize we had issues.' Before that, police in Maine had been primarily concerned with Oxycontin, a highly addictive prescription painkiller. Now cocaine and heroin have emerged as major problems here, and the cause is a combination of supply and demand. 'People who get hooked on it create their own demand, soliciting customers so they can pay for their habit,' said Strong, the Kittery police chief. In 2007, for example, SNIF detectives uncovered a cocaine ring operated by Leslie Smith, who did body work at a Kittery garage. Smith, 44, and three friends were making daily trips to Lawrence for cocaine, using some of it themselves and selling the rest in Kittery and Portsmouth at a 300 percent markup. The detectives, working with a DEA-led task force in Lawrence, arrested Smith and his friends. They also got his source, a Dominican dealer in Massachusetts, after Hamel made several undercover buys. All are in federal prison. In the past year, though, heroin has flooded Maine and New Hampshire as Oxycontin addicts turn to heroin. A bag of heroin costs about $5 on the street here today, compared with $50 for an Oxycontin tablet. 'Heroin arrests are up 100 percent from just three years ago,' Hamel added. 'And I can't remember the last junkie I busted for heroin who didn't say he started with Oxycontin. And why not? They can get a hit of heroin for less than a six-pack of beer.' (Begin optional trim) At Counseling Services Inc., an addiction treatment facility in Maine, medical director Dr. Patrick Maidman says the number of people seeking help for addiction to opiates like Oxycontin and heroin has been overwhelming. 'We're not able to manage the volume of people looking for help,' he said. It was five years ago that Bethany spent her last night at her best friend Amanda Corey's house, a New England colonial nestled in woods near I-95 and a sign that reads: 'Welcome to Maine. The Way Life Should Be.' Amanda tried for several hours to wake her friend that morning and finally called an ambulance in early afternoon. Bethany never regained consciousness and died later that day. 'If you had asked me back then how many teenagers were using heroin, I'd have said very few, and I couldn't name one,' Cryan said. 'Today, I can name 20.' The detectives traced the heroin to Scott Fisher, Bethany's 20-year-old boyfriend. Hamel began making undercover buys from Fisher and eventually arrested him. Fisher, now 24 and serving a 12-year federal prison term in Allenwood, Pa., recalls that time with sadness. 'I wish I had made different choices,' he said in a telephone interview from prison. Heroin and cocaine 'were so easy to obtain. It was just always easy. And it seemed like everyone was using.' Bethany's family saw him as a victim. 'Scott was just a kid who got caught up in this whole thing,' said Lachance, Bethany's sister. 'It was a tragedy not only for our family, but for him.' The SNIF detectives also tracked down Fisher's source, Juan Delacruz, an illegal immigrant from the Dominican Republic who worked in Lawrence as a drug runner. Delacruz is serving an eight-year sentence. The drug boss, a man known by the street name King Louie, returned to the Dominican Republic, authorities say. For the SNIF detectives, that was the first battle in an escalating war. (End optional trim) Hamel unlocked the Kittery Police evidence locker recently, revealing piles of yellow envelopes stuffed with heroin, cocaine, crack cocaine, chalky 're-rock' cocaine and tablets of Oxycontin and other prescription drugs. Each envelope represented a recent arrest -- the fruits of a small band of detectives on a mission. 