September 20, This series of reports simplifies the science of research findings for the educated lay public, legislators, educational groups, and practitioners. The series reports on research findings of national interest. Skip to main content.
Is there a link between marijuana use and psychiatric disorders? The AKT1 gene governs an enzyme that affects brain signaling involving the neurotransmitter dopamine. Altered dopamine signaling is known to be involved in schizophrenia. Source: Di Forti et al. Prev Index Next. Contents Letter From the Director What is marijuana? What is the scope of marijuana use in the United States? What are marijuana's effects? How does marijuana produce its effects? Does marijuana use affect driving? Is marijuana addictive?
What are marijuana's long-term effects on the brain? Is marijuana a gateway drug? How does marijuana use affect school, work, and social life? What are marijuana's effects on lung health? Is marijuana safe and effective as medicine? What are the effects of secondhand exposure to marijuana smoke? Can marijuana use during and after pregnancy harm the baby?
Ordering Publications Call or:. There have also been reports of tainted alcohol causing illness or blackouts. If you have any concerns, seek advice from your tour operator or the local authorities. Street crime is a serious problem in major cities and tourist resort areas. Pick-pocketing is common on the Mexico City Metro. Dress down and avoid wearing expensive jewellery or watches.
Keep a close watch on briefcases and luggage, even in apparently secure places like the lobby of your hotel. Be wary of people presenting themselves as police officers trying to fine or arrest you for no apparent reason. Foreign visitors and residents may be targeted by scam artists. Be wary of strangers approaching you or contacting you by phone asking for personal information or financial help. If you or your relatives or friends are asked to transfer money to Mexico make absolutely sure that it is not part of a scam and that you have properly checked with the person receiving the money that they are requesting it.
Victims are forced to withdraw funds from credit or debit cards at a cash point to secure their release. Where victims have friends or relatives living locally, a ransom may be demanded from them.
You should comply with requests and not attempt to resist such attacks. Longer-term kidnapping for financial gain also occurs, and there have been allegations of police officers being involved. Be discreet about discussing your financial or business affairs in places where you may be overheard by others. Driving standards are very different from the UK. Roads can be pot-holed. Be prepared to stop unexpectedly and beware of vehicles moving slowly, changing lane without indicating and going through red lights.
To reduce air pollution, Mexico City and some other parts of the country have introduced restrictions on driving. Cars may be forbidden from entering certain areas on particular days, based on their number plates.
These regulations are strictly enforced and offenders face heavy fines and temporary confiscation of their vehicle. This only applies to older vehicles and not to newer models which are often used for car hire. Please double check with your car hire company directly.
There is an additional driving restriction in Mexico City , where vehicles without registration plates from the State of Mexico Estado de Mexico or Mexico City are not allowed to enter Mexico City from Monday to Friday between am and am, and Saturday between am and pm. If air pollution is high, generally between February and June, further driving restrictions may apply. In remote areas, you may come across unofficial roadblocks, including on main roads, manned by local groups seeking money for an unofficial local toll. If you take part in adventurous sports including paragliding, skydiving, scuba diving and jet-skiing , make sure adequate safety precautions are in place.
Equipment may not meet UK safety and insurance standards. Only use reputable operators, and satisfy yourself that the company is using the most up-to-date equipment and safety features, and that they are fully licensed and insured. British nationals have been injured and in some cases killed participating in extreme sports.
Shark attacks are relatively rare in Mexico, but you should take care particularly when surfing, research the local area and follow the advice of the local authorities.
Crocodiles are present in Mexico, most commonly in lagoons and coastal areas. Sightings have been reported near tourist areas, including Cancun and resorts on the Pacific coast. There are signs warning about crocodiles around many lagoons in these areas. Tourists have been seriously injured in crocodile attacks in the past. In some hotels, balcony balustrades may not be as high as you expect and there could be a risk of falling.
Foreign nationals have been caught up in property scams. Before making financial commitments and buying property in Mexico, you should seek independent qualified legal advice. Mexico has an established multiparty democracy. Political demonstrations are common in Mexico City and can occur across the country. These can be tense and confrontational and could potentially turn violent.
Onlookers can be quickly drawn in. You should monitor local media and avoid all demonstrations. The Mexican constitution prohibits political activities by foreigners. Participation in demonstrations may result in detention and deportation. To help us improve GOV.
Singular? (has) or Plural? (have). For instance: There have been several robberies in the neighborhood. (robberies = plural). There has been a report of several. David Hayes explains when to use Has Been and Have Been after There. Contact David today for There ______ been numerous reports of looting. There.
It will take only 2 minutes to fill in. Skip to main content. Accept cookies. Cookie settings. Home Passports, travel and living abroad Travel abroad Foreign travel advice. Foreign travel advice Mexico.
Safety and security Violence Drug-related violence in Mexico has increased over recent years. North and west Many fatalities are suspected gang members killed in turf wars between the different organisations that compete for control of trafficking routes into the US.
East There have been reports of increased security incidents in the states of Tabasco and Veracruz. West and south Illegal roadblocks have been reported more frequently, particularly in the states of Guerrero, Oaxaca and Chiapas. Crime Crime and violence are serious problems in Mexico and the security situation can pose a risk for foreigners.
Adventure activities If you take part in adventurous sports including paragliding, skydiving, scuba diving and jet-skiing , make sure adequate safety precautions are in place. Swimming and water sports Shark attacks are relatively rare in Mexico, but you should take care particularly when surfing, research the local area and follow the advice of the local authorities.
Crocodiles Crocodiles are present in Mexico, most commonly in lagoons and coastal areas. Hotel safety In some hotels, balcony balustrades may not be as high as you expect and there could be a risk of falling.